1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /// 1 ///
3 /// Use zeroing allocator rather than allocato 2 /// Use zeroing allocator rather than allocator followed by memset with 0
4 /// 3 ///
5 /// This considers some simple cases that are 4 /// This considers some simple cases that are common and easy to validate
6 /// Note in particular that there are no ...s 5 /// Note in particular that there are no ...s in the rule, so all of the
7 /// matched code has to be contiguous 6 /// matched code has to be contiguous
8 /// 7 ///
9 // Confidence: High 8 // Confidence: High
10 // Copyright: (C) 2009-2010 Julia Lawall, Nico !! 9 // Copyright: (C) 2009-2010 Julia Lawall, Nicolas Palix, DIKU. GPLv2.
11 // Copyright: (C) 2009-2010 Gilles Muller, INR !! 10 // Copyright: (C) 2009-2010 Gilles Muller, INRIA/LiP6. GPLv2.
12 // Copyright: (C) 2017 Himanshu Jha !! 11 // Copyright: (C) 2017 Himanshu Jha GPLv2.
13 // URL: https://coccinelle.gitlabpages.inria.f !! 12 // URL: http://coccinelle.lip6.fr/rules/kzalloc.html
14 // Options: --no-includes --include-headers 13 // Options: --no-includes --include-headers
15 // 14 //
16 // Keywords: kmalloc, kzalloc 15 // Keywords: kmalloc, kzalloc
17 // Version min: < 2.6.12 kmalloc 16 // Version min: < 2.6.12 kmalloc
18 // Version min: 2.6.14 kzalloc 17 // Version min: 2.6.14 kzalloc
19 // 18 //
20 19
21 virtual context 20 virtual context
22 virtual patch 21 virtual patch
23 virtual org 22 virtual org
24 virtual report 23 virtual report
25 24
26 //-------------------------------------------- 25 //----------------------------------------------------------
27 // For context mode 26 // For context mode
28 //-------------------------------------------- 27 //----------------------------------------------------------
29 28
30 @depends on context@ 29 @depends on context@
31 type T, T2; 30 type T, T2;
32 expression x; 31 expression x;
33 expression E1; 32 expression E1;
34 statement S; 33 statement S;
35 @@ 34 @@
36 35
37 * x = (T)\(kmalloc(E1, ...)\|vmalloc(E1)\|dma_ 36 * x = (T)\(kmalloc(E1, ...)\|vmalloc(E1)\|dma_alloc_coherent(...,E1,...)\|
38 kmalloc_node(E1, ...)\|kmem_cache_alloc(...) 37 kmalloc_node(E1, ...)\|kmem_cache_alloc(...)\|kmem_alloc(E1, ...)\|
39 devm_kmalloc(...,E1,...)\|kvmalloc(E1, ...)\ 38 devm_kmalloc(...,E1,...)\|kvmalloc(E1, ...)\|kvmalloc_node(E1,...)\);
40 if ((x==NULL) || ...) S 39 if ((x==NULL) || ...) S
41 * memset((T2)x,0,E1); 40 * memset((T2)x,0,E1);
42 41
43 //-------------------------------------------- 42 //----------------------------------------------------------
44 // For patch mode 43 // For patch mode
45 //-------------------------------------------- 44 //----------------------------------------------------------
46 45
47 @depends on patch@ 46 @depends on patch@
48 type T, T2; 47 type T, T2;
49 expression x; 48 expression x;
50 expression E1,E2,E3,E4; 49 expression E1,E2,E3,E4;
51 statement S; 50 statement S;
52 @@ 51 @@
53 52
54 ( 53 (
55 - x = kmalloc(E1,E2); 54 - x = kmalloc(E1,E2);
56 + x = kzalloc(E1,E2); 55 + x = kzalloc(E1,E2);
57 | 56 |
58 - x = (T *)kmalloc(E1,E2); 57 - x = (T *)kmalloc(E1,E2);
59 + x = kzalloc(E1,E2); 58 + x = kzalloc(E1,E2);
60 | 59 |
61 - x = (T)kmalloc(E1,E2); 60 - x = (T)kmalloc(E1,E2);
62 + x = (T)kzalloc(E1,E2); 61 + x = (T)kzalloc(E1,E2);
63 | 62 |
64 - x = vmalloc(E1); 63 - x = vmalloc(E1);
65 + x = vzalloc(E1); 64 + x = vzalloc(E1);
66 | 65 |
67 - x = (T *)vmalloc(E1); 66 - x = (T *)vmalloc(E1);
68 + x = vzalloc(E1); 67 + x = vzalloc(E1);
69 | 68 |
70 - x = (T)vmalloc(E1); 69 - x = (T)vmalloc(E1);
71 + x = (T)vzalloc(E1); 70 + x = (T)vzalloc(E1);
72 | 71 |
73 - x = kmalloc_node(E1,E2,E3); 72 - x = kmalloc_node(E1,E2,E3);
74 + x = kzalloc_node(E1,E2,E3); 73 + x = kzalloc_node(E1,E2,E3);
75 | 74 |
76 - x = (T *)kmalloc_node(E1,E2,E3); 75 - x = (T *)kmalloc_node(E1,E2,E3);
77 + x = kzalloc_node(E1,E2,E3); 76 + x = kzalloc_node(E1,E2,E3);
78 | 77 |
79 - x = (T)kmalloc_node(E1,E2,E3); 78 - x = (T)kmalloc_node(E1,E2,E3);
80 + x = (T)kzalloc_node(E1,E2,E3); 79 + x = (T)kzalloc_node(E1,E2,E3);
81 | 80 |
82 - x = kmem_cache_alloc(E3,E4); 81 - x = kmem_cache_alloc(E3,E4);
83 + x = kmem_cache_zalloc(E3,E4); 82 + x = kmem_cache_zalloc(E3,E4);
84 | 83 |
85 - x = (T *)kmem_cache_alloc(E3,E4); 84 - x = (T *)kmem_cache_alloc(E3,E4);
86 + x = kmem_cache_zalloc(E3,E4); 85 + x = kmem_cache_zalloc(E3,E4);
87 | 86 |
88 - x = (T)kmem_cache_alloc(E3,E4); 87 - x = (T)kmem_cache_alloc(E3,E4);
89 + x = (T)kmem_cache_zalloc(E3,E4); 88 + x = (T)kmem_cache_zalloc(E3,E4);
90 | 89 |
91 - x = kmem_alloc(E1,E2); 90 - x = kmem_alloc(E1,E2);
92 + x = kmem_zalloc(E1,E2); 91 + x = kmem_zalloc(E1,E2);
93 | 92 |
94 - x = (T *)kmem_alloc(E1,E2); 93 - x = (T *)kmem_alloc(E1,E2);
95 + x = kmem_zalloc(E1,E2); 94 + x = kmem_zalloc(E1,E2);
96 | 95 |
97 - x = (T)kmem_alloc(E1,E2); 96 - x = (T)kmem_alloc(E1,E2);
98 + x = (T)kmem_zalloc(E1,E2); 97 + x = (T)kmem_zalloc(E1,E2);
99 | 98 |
100 - x = devm_kmalloc(E2,E1,E3); 99 - x = devm_kmalloc(E2,E1,E3);
101 + x = devm_kzalloc(E2,E1,E3); 100 + x = devm_kzalloc(E2,E1,E3);
102 | 101 |
103 - x = (T *)devm_kmalloc(E2,E1,E3); 102 - x = (T *)devm_kmalloc(E2,E1,E3);
104 + x = devm_kzalloc(E2,E1,E3); 103 + x = devm_kzalloc(E2,E1,E3);
105 | 104 |
106 - x = (T)devm_kmalloc(E2,E1,E3); 105 - x = (T)devm_kmalloc(E2,E1,E3);
107 + x = (T)devm_kzalloc(E2,E1,E3); 106 + x = (T)devm_kzalloc(E2,E1,E3);
108 | 107 |
109 - x = kvmalloc(E1,E2); 108 - x = kvmalloc(E1,E2);
110 + x = kvzalloc(E1,E2); 109 + x = kvzalloc(E1,E2);
111 | 110 |
112 - x = (T *)kvmalloc(E1,E2); 111 - x = (T *)kvmalloc(E1,E2);
113 + x = kvzalloc(E1,E2); 112 + x = kvzalloc(E1,E2);
114 | 113 |
115 - x = (T)kvmalloc(E1,E2); 114 - x = (T)kvmalloc(E1,E2);
116 + x = (T)kvzalloc(E1,E2); 115 + x = (T)kvzalloc(E1,E2);
117 | 116 |
118 - x = kvmalloc_node(E1,E2,E3); 117 - x = kvmalloc_node(E1,E2,E3);
119 + x = kvzalloc_node(E1,E2,E3); 118 + x = kvzalloc_node(E1,E2,E3);
120 | 119 |
121 - x = (T *)kvmalloc_node(E1,E2,E3); 120 - x = (T *)kvmalloc_node(E1,E2,E3);
122 + x = kvzalloc_node(E1,E2,E3); 121 + x = kvzalloc_node(E1,E2,E3);
123 | 122 |
124 - x = (T)kvmalloc_node(E1,E2,E3); 123 - x = (T)kvmalloc_node(E1,E2,E3);
125 + x = (T)kvzalloc_node(E1,E2,E3); 124 + x = (T)kvzalloc_node(E1,E2,E3);
126 ) 125 )
127 if ((x==NULL) || ...) S 126 if ((x==NULL) || ...) S
128 - memset((T2)x,0,E1); 127 - memset((T2)x,0,E1);
129 128
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 //-------------------------------------------- 129 //----------------------------------------------------------
141 // For org mode 130 // For org mode
142 //-------------------------------------------- 131 //----------------------------------------------------------
143 132
144 @r depends on org || report@ 133 @r depends on org || report@
145 type T, T2; 134 type T, T2;
146 expression x; 135 expression x;
147 expression E1,E2; 136 expression E1,E2;
148 statement S; 137 statement S;
149 position p; 138 position p;
150 @@ 139 @@
151 140
152 x = (T)kmalloc@p(E1,E2); 141 x = (T)kmalloc@p(E1,E2);
153 if ((x==NULL) || ...) S 142 if ((x==NULL) || ...) S
154 memset((T2)x,0,E1); 143 memset((T2)x,0,E1);
155 144
156 @script:python depends on org@ 145 @script:python depends on org@
157 p << r.p; 146 p << r.p;
158 x << r.x; 147 x << r.x;
159 @@ 148 @@
160 149
161 msg="%s" % (x) 150 msg="%s" % (x)
162 msg_safe=msg.replace("[","@(").replace("]",")" 151 msg_safe=msg.replace("[","@(").replace("]",")")
163 coccilib.org.print_todo(p[0], msg_safe) 152 coccilib.org.print_todo(p[0], msg_safe)
164 153
165 @script:python depends on report@ 154 @script:python depends on report@
166 p << r.p; 155 p << r.p;
167 x << r.x; 156 x << r.x;
168 @@ 157 @@
169 158
170 msg="WARNING: kzalloc should be used for %s, i 159 msg="WARNING: kzalloc should be used for %s, instead of kmalloc/memset" % (x)
171 coccilib.report.print_report(p[0], msg) 160 coccilib.report.print_report(p[0], msg)
172 161
173 //-------------------------------------------- 162 //-----------------------------------------------------------------
174 @r1 depends on org || report@ 163 @r1 depends on org || report@
175 type T, T2; 164 type T, T2;
176 expression x; 165 expression x;
177 expression E1; 166 expression E1;
178 statement S; 167 statement S;
179 position p; 168 position p;
180 @@ 169 @@
181 170
182 x = (T)vmalloc@p(E1); 171 x = (T)vmalloc@p(E1);
183 if ((x==NULL) || ...) S 172 if ((x==NULL) || ...) S
184 memset((T2)x,0,E1); 173 memset((T2)x,0,E1);
185 174
186 @script:python depends on org@ 175 @script:python depends on org@
187 p << r1.p; 176 p << r1.p;
188 x << r1.x; 177 x << r1.x;
189 @@ 178 @@
190 179
191 msg="%s" % (x) 180 msg="%s" % (x)
192 msg_safe=msg.replace("[","@(").replace("]",")" 181 msg_safe=msg.replace("[","@(").replace("]",")")
193 coccilib.org.print_todo(p[0], msg_safe) 182 coccilib.org.print_todo(p[0], msg_safe)
194 183
195 @script:python depends on report@ 184 @script:python depends on report@
196 p << r1.p; 185 p << r1.p;
197 x << r1.x; 186 x << r1.x;
198 @@ 187 @@
199 188
200 msg="WARNING: vzalloc should be used for %s, i 189 msg="WARNING: vzalloc should be used for %s, instead of vmalloc/memset" % (x)
201 coccilib.report.print_report(p[0], msg) 190 coccilib.report.print_report(p[0], msg)
202 191
203 //-------------------------------------------- 192 //-----------------------------------------------------------------
204 @r2 depends on org || report@ 193 @r2 depends on org || report@
205 type T, T2; 194 type T, T2;
206 expression x; 195 expression x;
207 expression E1,E2,E3,E4; 196 expression E1,E2,E3,E4;
208 statement S; 197 statement S;
209 position p; 198 position p;
210 @@ 199 @@
211 200
212 x = (T)dma_alloc_coherent@p(E1,E2,E3,E4); !! 201 x = (T)dma_alloc_coherent@p(E2,E1,E3,E4);
213 if ((x==NULL) || ...) S 202 if ((x==NULL) || ...) S
214 memset((T2)x,0,E2); !! 203 memset((T2)x,0,E1);
215 204
216 @script:python depends on org@ 205 @script:python depends on org@
217 p << r2.p; 206 p << r2.p;
218 x << r2.x; 207 x << r2.x;
219 @@ 208 @@
220 209
221 msg="%s" % (x) 210 msg="%s" % (x)
222 msg_safe=msg.replace("[","@(").replace("]",")" 211 msg_safe=msg.replace("[","@(").replace("]",")")
223 coccilib.org.print_todo(p[0], msg_safe) 212 coccilib.org.print_todo(p[0], msg_safe)
224 213
225 @script:python depends on report@ 214 @script:python depends on report@
226 p << r2.p; 215 p << r2.p;
227 x << r2.x; 216 x << r2.x;
228 @@ 217 @@
229 218
230 msg="WARNING: dma_alloc_coherent used in %s al !! 219 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) 220 coccilib.report.print_report(p[0], msg)
232 221
233 //-------------------------------------------- 222 //-----------------------------------------------------------------
234 @r3 depends on org || report@ 223 @r3 depends on org || report@
235 type T, T2; 224 type T, T2;
236 expression x; 225 expression x;
237 expression E1,E2,E3; 226 expression E1,E2,E3;
238 statement S; 227 statement S;
239 position p; 228 position p;
240 @@ 229 @@
241 230
242 x = (T)kmalloc_node@p(E1,E2,E3); 231 x = (T)kmalloc_node@p(E1,E2,E3);
243 if ((x==NULL) || ...) S 232 if ((x==NULL) || ...) S
244 memset((T2)x,0,E1); 233 memset((T2)x,0,E1);
245 234
246 @script:python depends on org@ 235 @script:python depends on org@
247 p << r3.p; 236 p << r3.p;
248 x << r3.x; 237 x << r3.x;
249 @@ 238 @@
250 239
251 msg="%s" % (x) 240 msg="%s" % (x)
252 msg_safe=msg.replace("[","@(").replace("]",")" 241 msg_safe=msg.replace("[","@(").replace("]",")")
253 coccilib.org.print_todo(p[0], msg_safe) 242 coccilib.org.print_todo(p[0], msg_safe)
254 243
255 @script:python depends on report@ 244 @script:python depends on report@
256 p << r3.p; 245 p << r3.p;
257 x << r3.x; 246 x << r3.x;
258 @@ 247 @@
259 248
260 msg="WARNING: kzalloc_node should be used for 249 msg="WARNING: kzalloc_node should be used for %s, instead of kmalloc_node/memset" % (x)
261 coccilib.report.print_report(p[0], msg) 250 coccilib.report.print_report(p[0], msg)
262 251
263 //-------------------------------------------- 252 //-----------------------------------------------------------------
264 @r4 depends on org || report@ 253 @r4 depends on org || report@
265 type T, T2; 254 type T, T2;
266 expression x; 255 expression x;
267 expression E1,E2,E3; 256 expression E1,E2,E3;
268 statement S; 257 statement S;
269 position p; 258 position p;
270 @@ 259 @@
271 260
272 x = (T)kmem_cache_alloc@p(E2,E3); 261 x = (T)kmem_cache_alloc@p(E2,E3);
273 if ((x==NULL) || ...) S 262 if ((x==NULL) || ...) S
274 memset((T2)x,0,E1); 263 memset((T2)x,0,E1);
275 264
276 @script:python depends on org@ 265 @script:python depends on org@
277 p << r4.p; 266 p << r4.p;
278 x << r4.x; 267 x << r4.x;
279 @@ 268 @@
280 269
281 msg="%s" % (x) 270 msg="%s" % (x)
282 msg_safe=msg.replace("[","@(").replace("]",")" 271 msg_safe=msg.replace("[","@(").replace("]",")")
283 coccilib.org.print_todo(p[0], msg_safe) 272 coccilib.org.print_todo(p[0], msg_safe)
284 273
285 @script:python depends on report@ 274 @script:python depends on report@
286 p << r4.p; 275 p << r4.p;
287 x << r4.x; 276 x << r4.x;
288 @@ 277 @@
289 278
290 msg="WARNING: kmem_cache_zalloc should be used 279 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) 280 coccilib.report.print_report(p[0], msg)
292 281
293 //-------------------------------------------- 282 //-----------------------------------------------------------------
294 @r5 depends on org || report@ 283 @r5 depends on org || report@
295 type T, T2; 284 type T, T2;
296 expression x; 285 expression x;
297 expression E1,E2; 286 expression E1,E2;
298 statement S; 287 statement S;
299 position p; 288 position p;
300 @@ 289 @@
301 290
302 x = (T)kmem_alloc@p(E1,E2); 291 x = (T)kmem_alloc@p(E1,E2);
303 if ((x==NULL) || ...) S 292 if ((x==NULL) || ...) S
304 memset((T2)x,0,E1); 293 memset((T2)x,0,E1);
305 294
306 @script:python depends on org@ 295 @script:python depends on org@
307 p << r5.p; 296 p << r5.p;
308 x << r5.x; 297 x << r5.x;
309 @@ 298 @@
310 299
311 msg="%s" % (x) 300 msg="%s" % (x)
312 msg_safe=msg.replace("[","@(").replace("]",")" 301 msg_safe=msg.replace("[","@(").replace("]",")")
313 coccilib.org.print_todo(p[0], msg_safe) 302 coccilib.org.print_todo(p[0], msg_safe)
314 303
315 @script:python depends on report@ 304 @script:python depends on report@
316 p << r5.p; 305 p << r5.p;
317 x << r5.x; 306 x << r5.x;
318 @@ 307 @@
319 308
320 msg="WARNING: kmem_zalloc should be used for % 309 msg="WARNING: kmem_zalloc should be used for %s, instead of kmem_alloc/memset" % (x)
321 coccilib.report.print_report(p[0], msg) 310 coccilib.report.print_report(p[0], msg)
322 311
323 //-------------------------------------------- 312 //-----------------------------------------------------------------
324 @r6 depends on org || report@ 313 @r6 depends on org || report@
325 type T, T2; 314 type T, T2;
326 expression x; 315 expression x;
327 expression E1,E2,E3; 316 expression E1,E2,E3;
328 statement S; 317 statement S;
329 position p; 318 position p;
330 @@ 319 @@
331 320
332 x = (T)devm_kmalloc@p(E2,E1,E3); 321 x = (T)devm_kmalloc@p(E2,E1,E3);
333 if ((x==NULL) || ...) S 322 if ((x==NULL) || ...) S
334 memset((T2)x,0,E1); 323 memset((T2)x,0,E1);
335 324
336 @script:python depends on org@ 325 @script:python depends on org@
337 p << r6.p; 326 p << r6.p;
338 x << r6.x; 327 x << r6.x;
339 @@ 328 @@
340 329
341 msg="%s" % (x) 330 msg="%s" % (x)
342 msg_safe=msg.replace("[","@(").replace("]",")" 331 msg_safe=msg.replace("[","@(").replace("]",")")
343 coccilib.org.print_todo(p[0], msg_safe) 332 coccilib.org.print_todo(p[0], msg_safe)
344 333
345 @script:python depends on report@ 334 @script:python depends on report@
346 p << r6.p; 335 p << r6.p;
347 x << r6.x; 336 x << r6.x;
348 @@ 337 @@
349 338
350 msg="WARNING: devm_kzalloc should be used for 339 msg="WARNING: devm_kzalloc should be used for %s, instead of devm_kmalloc/memset" % (x)
351 coccilib.report.print_report(p[0], msg) 340 coccilib.report.print_report(p[0], msg)
352 341
353 //-------------------------------------------- 342 //-----------------------------------------------------------------
354 @r7 depends on org || report@ 343 @r7 depends on org || report@
355 type T, T2; 344 type T, T2;
356 expression x; 345 expression x;
357 expression E1,E2; 346 expression E1,E2;
358 statement S; 347 statement S;
359 position p; 348 position p;
360 @@ 349 @@
361 350
362 x = (T)kvmalloc@p(E1,E2); 351 x = (T)kvmalloc@p(E1,E2);
363 if ((x==NULL) || ...) S 352 if ((x==NULL) || ...) S
364 memset((T2)x,0,E1); 353 memset((T2)x,0,E1);
365 354
366 @script:python depends on org@ 355 @script:python depends on org@
367 p << r7.p; 356 p << r7.p;
368 x << r7.x; 357 x << r7.x;
369 @@ 358 @@
370 359
371 msg="%s" % (x) 360 msg="%s" % (x)
372 msg_safe=msg.replace("[","@(").replace("]",")" 361 msg_safe=msg.replace("[","@(").replace("]",")")
373 coccilib.org.print_todo(p[0], msg_safe) 362 coccilib.org.print_todo(p[0], msg_safe)
374 363
375 @script:python depends on report@ 364 @script:python depends on report@
376 p << r7.p; 365 p << r7.p;
377 x << r7.x; 366 x << r7.x;
378 @@ 367 @@
379 368
380 msg="WARNING: kvzalloc should be used for %s, 369 msg="WARNING: kvzalloc should be used for %s, instead of kvmalloc/memset" % (x)
381 coccilib.report.print_report(p[0], msg) 370 coccilib.report.print_report(p[0], msg)
382 371
383 //-------------------------------------------- 372 //-----------------------------------------------------------------
384 @r9 depends on org || report@ 373 @r9 depends on org || report@
385 type T, T2; 374 type T, T2;
386 expression x; 375 expression x;
387 expression E1,E2,E3; 376 expression E1,E2,E3;
388 statement S; 377 statement S;
389 position p; 378 position p;
390 @@ 379 @@
391 380
392 x = (T)kvmalloc_node@p(E1,E2,E3); 381 x = (T)kvmalloc_node@p(E1,E2,E3);
393 if ((x==NULL) || ...) S 382 if ((x==NULL) || ...) S
394 memset((T2)x,0,E1); 383 memset((T2)x,0,E1);
395 384
396 @script:python depends on org@ 385 @script:python depends on org@
397 p << r9.p; 386 p << r9.p;
398 x << r9.x; 387 x << r9.x;
399 @@ 388 @@
400 389
401 msg="%s" % (x) 390 msg="%s" % (x)
402 msg_safe=msg.replace("[","@(").replace("]",")" 391 msg_safe=msg.replace("[","@(").replace("]",")")
403 coccilib.org.print_todo(p[0], msg_safe) 392 coccilib.org.print_todo(p[0], msg_safe)
404 393
405 @script:python depends on report@ 394 @script:python depends on report@
406 p << r9.p; 395 p << r9.p;
407 x << r9.x; 396 x << r9.x;
408 @@ 397 @@
409 398
410 msg="WARNING: kvzalloc_node should be used for 399 msg="WARNING: kvzalloc_node should be used for %s, instead of kvmalloc_node/memset" % (x)
411 coccilib.report.print_report(p[0], msg) 400 coccilib.report.print_report(p[0], msg)
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