1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /// 2 ///
3 /// Use zeroing allocator rather than allocato 3 /// Use zeroing allocator rather than allocator followed by memset with 0
4 /// 4 ///
5 /// This considers some simple cases that are 5 /// This considers some simple cases that are common and easy to validate
6 /// Note in particular that there are no ...s 6 /// Note in particular that there are no ...s in the rule, so all of the
7 /// matched code has to be contiguous 7 /// matched code has to be contiguous
8 /// 8 ///
9 // Confidence: High 9 // Confidence: High
10 // Copyright: (C) 2009-2010 Julia Lawall, Nico 10 // Copyright: (C) 2009-2010 Julia Lawall, Nicolas Palix, DIKU.
11 // Copyright: (C) 2009-2010 Gilles Muller, INR 11 // Copyright: (C) 2009-2010 Gilles Muller, INRIA/LiP6.
12 // Copyright: (C) 2017 Himanshu Jha 12 // Copyright: (C) 2017 Himanshu Jha
13 // URL: https://coccinelle.gitlabpages.inria.f !! 13 // URL: http://coccinelle.lip6.fr/rules/kzalloc.html
14 // Options: --no-includes --include-headers 14 // Options: --no-includes --include-headers
15 // 15 //
16 // Keywords: kmalloc, kzalloc 16 // Keywords: kmalloc, kzalloc
17 // Version min: < 2.6.12 kmalloc 17 // Version min: < 2.6.12 kmalloc
18 // Version min: 2.6.14 kzalloc 18 // Version min: 2.6.14 kzalloc
19 // 19 //
20 20
21 virtual context 21 virtual context
22 virtual patch 22 virtual patch
23 virtual org 23 virtual org
24 virtual report 24 virtual report
25 25
26 //-------------------------------------------- 26 //----------------------------------------------------------
27 // For context mode 27 // For context mode
28 //-------------------------------------------- 28 //----------------------------------------------------------
29 29
30 @depends on context@ 30 @depends on context@
31 type T, T2; 31 type T, T2;
32 expression x; 32 expression x;
33 expression E1; 33 expression E1;
34 statement S; 34 statement S;
35 @@ 35 @@
36 36
37 * x = (T)\(kmalloc(E1, ...)\|vmalloc(E1)\|dma_ 37 * x = (T)\(kmalloc(E1, ...)\|vmalloc(E1)\|dma_alloc_coherent(...,E1,...)\|
38 kmalloc_node(E1, ...)\|kmem_cache_alloc(...) 38 kmalloc_node(E1, ...)\|kmem_cache_alloc(...)\|kmem_alloc(E1, ...)\|
39 devm_kmalloc(...,E1,...)\|kvmalloc(E1, ...)\ 39 devm_kmalloc(...,E1,...)\|kvmalloc(E1, ...)\|kvmalloc_node(E1,...)\);
40 if ((x==NULL) || ...) S 40 if ((x==NULL) || ...) S
41 * memset((T2)x,0,E1); 41 * memset((T2)x,0,E1);
42 42
43 //-------------------------------------------- 43 //----------------------------------------------------------
44 // For patch mode 44 // For patch mode
45 //-------------------------------------------- 45 //----------------------------------------------------------
46 46
47 @depends on patch@ 47 @depends on patch@
48 type T, T2; 48 type T, T2;
49 expression x; 49 expression x;
50 expression E1,E2,E3,E4; 50 expression E1,E2,E3,E4;
51 statement S; 51 statement S;
52 @@ 52 @@
53 53
54 ( 54 (
55 - x = kmalloc(E1,E2); 55 - x = kmalloc(E1,E2);
56 + x = kzalloc(E1,E2); 56 + x = kzalloc(E1,E2);
57 | 57 |
58 - x = (T *)kmalloc(E1,E2); 58 - x = (T *)kmalloc(E1,E2);
59 + x = kzalloc(E1,E2); 59 + x = kzalloc(E1,E2);
60 | 60 |
61 - x = (T)kmalloc(E1,E2); 61 - x = (T)kmalloc(E1,E2);
62 + x = (T)kzalloc(E1,E2); 62 + x = (T)kzalloc(E1,E2);
63 | 63 |
64 - x = vmalloc(E1); 64 - x = vmalloc(E1);
65 + x = vzalloc(E1); 65 + x = vzalloc(E1);
66 | 66 |
67 - x = (T *)vmalloc(E1); 67 - x = (T *)vmalloc(E1);
68 + x = vzalloc(E1); 68 + x = vzalloc(E1);
69 | 69 |
70 - x = (T)vmalloc(E1); 70 - x = (T)vmalloc(E1);
71 + x = (T)vzalloc(E1); 71 + x = (T)vzalloc(E1);
72 | 72 |
73 - x = kmalloc_node(E1,E2,E3); 73 - x = kmalloc_node(E1,E2,E3);
74 + x = kzalloc_node(E1,E2,E3); 74 + x = kzalloc_node(E1,E2,E3);
75 | 75 |
76 - x = (T *)kmalloc_node(E1,E2,E3); 76 - x = (T *)kmalloc_node(E1,E2,E3);
77 + x = kzalloc_node(E1,E2,E3); 77 + x = kzalloc_node(E1,E2,E3);
78 | 78 |
79 - x = (T)kmalloc_node(E1,E2,E3); 79 - x = (T)kmalloc_node(E1,E2,E3);
80 + x = (T)kzalloc_node(E1,E2,E3); 80 + x = (T)kzalloc_node(E1,E2,E3);
81 | 81 |
82 - x = kmem_cache_alloc(E3,E4); 82 - x = kmem_cache_alloc(E3,E4);
83 + x = kmem_cache_zalloc(E3,E4); 83 + x = kmem_cache_zalloc(E3,E4);
84 | 84 |
85 - x = (T *)kmem_cache_alloc(E3,E4); 85 - x = (T *)kmem_cache_alloc(E3,E4);
86 + x = kmem_cache_zalloc(E3,E4); 86 + x = kmem_cache_zalloc(E3,E4);
87 | 87 |
88 - x = (T)kmem_cache_alloc(E3,E4); 88 - x = (T)kmem_cache_alloc(E3,E4);
89 + x = (T)kmem_cache_zalloc(E3,E4); 89 + x = (T)kmem_cache_zalloc(E3,E4);
90 | 90 |
91 - x = kmem_alloc(E1,E2); 91 - x = kmem_alloc(E1,E2);
92 + x = kmem_zalloc(E1,E2); 92 + x = kmem_zalloc(E1,E2);
93 | 93 |
94 - x = (T *)kmem_alloc(E1,E2); 94 - x = (T *)kmem_alloc(E1,E2);
95 + x = kmem_zalloc(E1,E2); 95 + x = kmem_zalloc(E1,E2);
96 | 96 |
97 - x = (T)kmem_alloc(E1,E2); 97 - x = (T)kmem_alloc(E1,E2);
98 + x = (T)kmem_zalloc(E1,E2); 98 + x = (T)kmem_zalloc(E1,E2);
99 | 99 |
100 - x = devm_kmalloc(E2,E1,E3); 100 - x = devm_kmalloc(E2,E1,E3);
101 + x = devm_kzalloc(E2,E1,E3); 101 + x = devm_kzalloc(E2,E1,E3);
102 | 102 |
103 - x = (T *)devm_kmalloc(E2,E1,E3); 103 - x = (T *)devm_kmalloc(E2,E1,E3);
104 + x = devm_kzalloc(E2,E1,E3); 104 + x = devm_kzalloc(E2,E1,E3);
105 | 105 |
106 - x = (T)devm_kmalloc(E2,E1,E3); 106 - x = (T)devm_kmalloc(E2,E1,E3);
107 + x = (T)devm_kzalloc(E2,E1,E3); 107 + x = (T)devm_kzalloc(E2,E1,E3);
108 | 108 |
109 - x = kvmalloc(E1,E2); 109 - x = kvmalloc(E1,E2);
110 + x = kvzalloc(E1,E2); 110 + x = kvzalloc(E1,E2);
111 | 111 |
112 - x = (T *)kvmalloc(E1,E2); 112 - x = (T *)kvmalloc(E1,E2);
113 + x = kvzalloc(E1,E2); 113 + x = kvzalloc(E1,E2);
114 | 114 |
115 - x = (T)kvmalloc(E1,E2); 115 - x = (T)kvmalloc(E1,E2);
116 + x = (T)kvzalloc(E1,E2); 116 + x = (T)kvzalloc(E1,E2);
117 | 117 |
118 - x = kvmalloc_node(E1,E2,E3); 118 - x = kvmalloc_node(E1,E2,E3);
119 + x = kvzalloc_node(E1,E2,E3); 119 + x = kvzalloc_node(E1,E2,E3);
120 | 120 |
121 - x = (T *)kvmalloc_node(E1,E2,E3); 121 - x = (T *)kvmalloc_node(E1,E2,E3);
122 + x = kvzalloc_node(E1,E2,E3); 122 + x = kvzalloc_node(E1,E2,E3);
123 | 123 |
124 - x = (T)kvmalloc_node(E1,E2,E3); 124 - x = (T)kvmalloc_node(E1,E2,E3);
125 + x = (T)kvzalloc_node(E1,E2,E3); 125 + x = (T)kvzalloc_node(E1,E2,E3);
126 ) 126 )
127 if ((x==NULL) || ...) S 127 if ((x==NULL) || ...) S
128 - memset((T2)x,0,E1); 128 - memset((T2)x,0,E1);
129 129
130 @depends on patch@ <<
131 type T, T2; <<
132 expression x; <<
133 expression E1,E2,E3,E4; <<
134 statement S; <<
135 @@ <<
136 x = (T)dma_alloc_coherent(E1, E2, E3, E4); <<
137 if ((x==NULL) || ...) S <<
138 - memset((T2)x, 0, E2); <<
139 <<
140 //-------------------------------------------- 130 //----------------------------------------------------------
141 // For org mode 131 // For org mode
142 //-------------------------------------------- 132 //----------------------------------------------------------
143 133
144 @r depends on org || report@ 134 @r depends on org || report@
145 type T, T2; 135 type T, T2;
146 expression x; 136 expression x;
147 expression E1,E2; 137 expression E1,E2;
148 statement S; 138 statement S;
149 position p; 139 position p;
150 @@ 140 @@
151 141
152 x = (T)kmalloc@p(E1,E2); 142 x = (T)kmalloc@p(E1,E2);
153 if ((x==NULL) || ...) S 143 if ((x==NULL) || ...) S
154 memset((T2)x,0,E1); 144 memset((T2)x,0,E1);
155 145
156 @script:python depends on org@ 146 @script:python depends on org@
157 p << r.p; 147 p << r.p;
158 x << r.x; 148 x << r.x;
159 @@ 149 @@
160 150
161 msg="%s" % (x) 151 msg="%s" % (x)
162 msg_safe=msg.replace("[","@(").replace("]",")" 152 msg_safe=msg.replace("[","@(").replace("]",")")
163 coccilib.org.print_todo(p[0], msg_safe) 153 coccilib.org.print_todo(p[0], msg_safe)
164 154
165 @script:python depends on report@ 155 @script:python depends on report@
166 p << r.p; 156 p << r.p;
167 x << r.x; 157 x << r.x;
168 @@ 158 @@
169 159
170 msg="WARNING: kzalloc should be used for %s, i 160 msg="WARNING: kzalloc should be used for %s, instead of kmalloc/memset" % (x)
171 coccilib.report.print_report(p[0], msg) 161 coccilib.report.print_report(p[0], msg)
172 162
173 //-------------------------------------------- 163 //-----------------------------------------------------------------
174 @r1 depends on org || report@ 164 @r1 depends on org || report@
175 type T, T2; 165 type T, T2;
176 expression x; 166 expression x;
177 expression E1; 167 expression E1;
178 statement S; 168 statement S;
179 position p; 169 position p;
180 @@ 170 @@
181 171
182 x = (T)vmalloc@p(E1); 172 x = (T)vmalloc@p(E1);
183 if ((x==NULL) || ...) S 173 if ((x==NULL) || ...) S
184 memset((T2)x,0,E1); 174 memset((T2)x,0,E1);
185 175
186 @script:python depends on org@ 176 @script:python depends on org@
187 p << r1.p; 177 p << r1.p;
188 x << r1.x; 178 x << r1.x;
189 @@ 179 @@
190 180
191 msg="%s" % (x) 181 msg="%s" % (x)
192 msg_safe=msg.replace("[","@(").replace("]",")" 182 msg_safe=msg.replace("[","@(").replace("]",")")
193 coccilib.org.print_todo(p[0], msg_safe) 183 coccilib.org.print_todo(p[0], msg_safe)
194 184
195 @script:python depends on report@ 185 @script:python depends on report@
196 p << r1.p; 186 p << r1.p;
197 x << r1.x; 187 x << r1.x;
198 @@ 188 @@
199 189
200 msg="WARNING: vzalloc should be used for %s, i 190 msg="WARNING: vzalloc should be used for %s, instead of vmalloc/memset" % (x)
201 coccilib.report.print_report(p[0], msg) 191 coccilib.report.print_report(p[0], msg)
202 192
203 //-------------------------------------------- 193 //-----------------------------------------------------------------
204 @r2 depends on org || report@ 194 @r2 depends on org || report@
205 type T, T2; 195 type T, T2;
206 expression x; 196 expression x;
207 expression E1,E2,E3,E4; 197 expression E1,E2,E3,E4;
208 statement S; 198 statement S;
209 position p; 199 position p;
210 @@ 200 @@
211 201
212 x = (T)dma_alloc_coherent@p(E1,E2,E3,E4); !! 202 x = (T)dma_alloc_coherent@p(E2,E1,E3,E4);
213 if ((x==NULL) || ...) S 203 if ((x==NULL) || ...) S
214 memset((T2)x,0,E2); !! 204 memset((T2)x,0,E1);
215 205
216 @script:python depends on org@ 206 @script:python depends on org@
217 p << r2.p; 207 p << r2.p;
218 x << r2.x; 208 x << r2.x;
219 @@ 209 @@
220 210
221 msg="%s" % (x) 211 msg="%s" % (x)
222 msg_safe=msg.replace("[","@(").replace("]",")" 212 msg_safe=msg.replace("[","@(").replace("]",")")
223 coccilib.org.print_todo(p[0], msg_safe) 213 coccilib.org.print_todo(p[0], msg_safe)
224 214
225 @script:python depends on report@ 215 @script:python depends on report@
226 p << r2.p; 216 p << r2.p;
227 x << r2.x; 217 x << r2.x;
228 @@ 218 @@
229 219
230 msg="WARNING: dma_alloc_coherent used in %s al !! 220 msg="WARNING: dma_alloc_coherent use in %s already zeroes out memory, so memset is not needed" % (x)
231 coccilib.report.print_report(p[0], msg) 221 coccilib.report.print_report(p[0], msg)
232 222
233 //-------------------------------------------- 223 //-----------------------------------------------------------------
234 @r3 depends on org || report@ 224 @r3 depends on org || report@
235 type T, T2; 225 type T, T2;
236 expression x; 226 expression x;
237 expression E1,E2,E3; 227 expression E1,E2,E3;
238 statement S; 228 statement S;
239 position p; 229 position p;
240 @@ 230 @@
241 231
242 x = (T)kmalloc_node@p(E1,E2,E3); 232 x = (T)kmalloc_node@p(E1,E2,E3);
243 if ((x==NULL) || ...) S 233 if ((x==NULL) || ...) S
244 memset((T2)x,0,E1); 234 memset((T2)x,0,E1);
245 235
246 @script:python depends on org@ 236 @script:python depends on org@
247 p << r3.p; 237 p << r3.p;
248 x << r3.x; 238 x << r3.x;
249 @@ 239 @@
250 240
251 msg="%s" % (x) 241 msg="%s" % (x)
252 msg_safe=msg.replace("[","@(").replace("]",")" 242 msg_safe=msg.replace("[","@(").replace("]",")")
253 coccilib.org.print_todo(p[0], msg_safe) 243 coccilib.org.print_todo(p[0], msg_safe)
254 244
255 @script:python depends on report@ 245 @script:python depends on report@
256 p << r3.p; 246 p << r3.p;
257 x << r3.x; 247 x << r3.x;
258 @@ 248 @@
259 249
260 msg="WARNING: kzalloc_node should be used for 250 msg="WARNING: kzalloc_node should be used for %s, instead of kmalloc_node/memset" % (x)
261 coccilib.report.print_report(p[0], msg) 251 coccilib.report.print_report(p[0], msg)
262 252
263 //-------------------------------------------- 253 //-----------------------------------------------------------------
264 @r4 depends on org || report@ 254 @r4 depends on org || report@
265 type T, T2; 255 type T, T2;
266 expression x; 256 expression x;
267 expression E1,E2,E3; 257 expression E1,E2,E3;
268 statement S; 258 statement S;
269 position p; 259 position p;
270 @@ 260 @@
271 261
272 x = (T)kmem_cache_alloc@p(E2,E3); 262 x = (T)kmem_cache_alloc@p(E2,E3);
273 if ((x==NULL) || ...) S 263 if ((x==NULL) || ...) S
274 memset((T2)x,0,E1); 264 memset((T2)x,0,E1);
275 265
276 @script:python depends on org@ 266 @script:python depends on org@
277 p << r4.p; 267 p << r4.p;
278 x << r4.x; 268 x << r4.x;
279 @@ 269 @@
280 270
281 msg="%s" % (x) 271 msg="%s" % (x)
282 msg_safe=msg.replace("[","@(").replace("]",")" 272 msg_safe=msg.replace("[","@(").replace("]",")")
283 coccilib.org.print_todo(p[0], msg_safe) 273 coccilib.org.print_todo(p[0], msg_safe)
284 274
285 @script:python depends on report@ 275 @script:python depends on report@
286 p << r4.p; 276 p << r4.p;
287 x << r4.x; 277 x << r4.x;
288 @@ 278 @@
289 279
290 msg="WARNING: kmem_cache_zalloc should be used 280 msg="WARNING: kmem_cache_zalloc should be used for %s, instead of kmem_cache_alloc/memset" % (x)
291 coccilib.report.print_report(p[0], msg) 281 coccilib.report.print_report(p[0], msg)
292 282
293 //-------------------------------------------- 283 //-----------------------------------------------------------------
294 @r5 depends on org || report@ 284 @r5 depends on org || report@
295 type T, T2; 285 type T, T2;
296 expression x; 286 expression x;
297 expression E1,E2; 287 expression E1,E2;
298 statement S; 288 statement S;
299 position p; 289 position p;
300 @@ 290 @@
301 291
302 x = (T)kmem_alloc@p(E1,E2); 292 x = (T)kmem_alloc@p(E1,E2);
303 if ((x==NULL) || ...) S 293 if ((x==NULL) || ...) S
304 memset((T2)x,0,E1); 294 memset((T2)x,0,E1);
305 295
306 @script:python depends on org@ 296 @script:python depends on org@
307 p << r5.p; 297 p << r5.p;
308 x << r5.x; 298 x << r5.x;
309 @@ 299 @@
310 300
311 msg="%s" % (x) 301 msg="%s" % (x)
312 msg_safe=msg.replace("[","@(").replace("]",")" 302 msg_safe=msg.replace("[","@(").replace("]",")")
313 coccilib.org.print_todo(p[0], msg_safe) 303 coccilib.org.print_todo(p[0], msg_safe)
314 304
315 @script:python depends on report@ 305 @script:python depends on report@
316 p << r5.p; 306 p << r5.p;
317 x << r5.x; 307 x << r5.x;
318 @@ 308 @@
319 309
320 msg="WARNING: kmem_zalloc should be used for % 310 msg="WARNING: kmem_zalloc should be used for %s, instead of kmem_alloc/memset" % (x)
321 coccilib.report.print_report(p[0], msg) 311 coccilib.report.print_report(p[0], msg)
322 312
323 //-------------------------------------------- 313 //-----------------------------------------------------------------
324 @r6 depends on org || report@ 314 @r6 depends on org || report@
325 type T, T2; 315 type T, T2;
326 expression x; 316 expression x;
327 expression E1,E2,E3; 317 expression E1,E2,E3;
328 statement S; 318 statement S;
329 position p; 319 position p;
330 @@ 320 @@
331 321
332 x = (T)devm_kmalloc@p(E2,E1,E3); 322 x = (T)devm_kmalloc@p(E2,E1,E3);
333 if ((x==NULL) || ...) S 323 if ((x==NULL) || ...) S
334 memset((T2)x,0,E1); 324 memset((T2)x,0,E1);
335 325
336 @script:python depends on org@ 326 @script:python depends on org@
337 p << r6.p; 327 p << r6.p;
338 x << r6.x; 328 x << r6.x;
339 @@ 329 @@
340 330
341 msg="%s" % (x) 331 msg="%s" % (x)
342 msg_safe=msg.replace("[","@(").replace("]",")" 332 msg_safe=msg.replace("[","@(").replace("]",")")
343 coccilib.org.print_todo(p[0], msg_safe) 333 coccilib.org.print_todo(p[0], msg_safe)
344 334
345 @script:python depends on report@ 335 @script:python depends on report@
346 p << r6.p; 336 p << r6.p;
347 x << r6.x; 337 x << r6.x;
348 @@ 338 @@
349 339
350 msg="WARNING: devm_kzalloc should be used for 340 msg="WARNING: devm_kzalloc should be used for %s, instead of devm_kmalloc/memset" % (x)
351 coccilib.report.print_report(p[0], msg) 341 coccilib.report.print_report(p[0], msg)
352 342
353 //-------------------------------------------- 343 //-----------------------------------------------------------------
354 @r7 depends on org || report@ 344 @r7 depends on org || report@
355 type T, T2; 345 type T, T2;
356 expression x; 346 expression x;
357 expression E1,E2; 347 expression E1,E2;
358 statement S; 348 statement S;
359 position p; 349 position p;
360 @@ 350 @@
361 351
362 x = (T)kvmalloc@p(E1,E2); 352 x = (T)kvmalloc@p(E1,E2);
363 if ((x==NULL) || ...) S 353 if ((x==NULL) || ...) S
364 memset((T2)x,0,E1); 354 memset((T2)x,0,E1);
365 355
366 @script:python depends on org@ 356 @script:python depends on org@
367 p << r7.p; 357 p << r7.p;
368 x << r7.x; 358 x << r7.x;
369 @@ 359 @@
370 360
371 msg="%s" % (x) 361 msg="%s" % (x)
372 msg_safe=msg.replace("[","@(").replace("]",")" 362 msg_safe=msg.replace("[","@(").replace("]",")")
373 coccilib.org.print_todo(p[0], msg_safe) 363 coccilib.org.print_todo(p[0], msg_safe)
374 364
375 @script:python depends on report@ 365 @script:python depends on report@
376 p << r7.p; 366 p << r7.p;
377 x << r7.x; 367 x << r7.x;
378 @@ 368 @@
379 369
380 msg="WARNING: kvzalloc should be used for %s, 370 msg="WARNING: kvzalloc should be used for %s, instead of kvmalloc/memset" % (x)
381 coccilib.report.print_report(p[0], msg) 371 coccilib.report.print_report(p[0], msg)
382 372
383 //-------------------------------------------- 373 //-----------------------------------------------------------------
384 @r9 depends on org || report@ 374 @r9 depends on org || report@
385 type T, T2; 375 type T, T2;
386 expression x; 376 expression x;
387 expression E1,E2,E3; 377 expression E1,E2,E3;
388 statement S; 378 statement S;
389 position p; 379 position p;
390 @@ 380 @@
391 381
392 x = (T)kvmalloc_node@p(E1,E2,E3); 382 x = (T)kvmalloc_node@p(E1,E2,E3);
393 if ((x==NULL) || ...) S 383 if ((x==NULL) || ...) S
394 memset((T2)x,0,E1); 384 memset((T2)x,0,E1);
395 385
396 @script:python depends on org@ 386 @script:python depends on org@
397 p << r9.p; 387 p << r9.p;
398 x << r9.x; 388 x << r9.x;
399 @@ 389 @@
400 390
401 msg="%s" % (x) 391 msg="%s" % (x)
402 msg_safe=msg.replace("[","@(").replace("]",")" 392 msg_safe=msg.replace("[","@(").replace("]",")")
403 coccilib.org.print_todo(p[0], msg_safe) 393 coccilib.org.print_todo(p[0], msg_safe)
404 394
405 @script:python depends on report@ 395 @script:python depends on report@
406 p << r9.p; 396 p << r9.p;
407 x << r9.x; 397 x << r9.x;
408 @@ 398 @@
409 399
410 msg="WARNING: kvzalloc_node should be used for 400 msg="WARNING: kvzalloc_node should be used for %s, instead of kvmalloc_node/memset" % (x)
411 coccilib.report.print_report(p[0], msg) 401 coccilib.report.print_report(p[0], msg)
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