1 // SPDX-License-Identifier: GPL-2.0-only
2 /// NULL check before some freeing functions is not needed.
3 ///
4 /// Based on checkpatch warning
5 /// "kfree(NULL) is safe this check is probably not required"
6 /// and kfreeaddr.cocci by Julia Lawall.
7 ///
8 // Copyright: (C) 2014 Fabian Frederick.
9 // Comments: -
10 // Options: --no-includes --include-headers
11
12 virtual patch
13 virtual org
14 virtual report
15 virtual context
16
17 @r2 depends on patch@
18 expression E;
19 @@
20 - if (E != NULL)
21 (
22 kfree(E);
23 |
24 kvfree(E);
25 |
26 kfree_sensitive(E);
27 |
28 kvfree_sensitive(E, ...);
29 |
30 vfree(E);
31 |
32 debugfs_remove(E);
33 |
34 debugfs_remove_recursive(E);
35 |
36 usb_free_urb(E);
37 |
38 kmem_cache_destroy(E);
39 |
40 mempool_destroy(E);
41 |
42 dma_pool_destroy(E);
43 )
44
45 @r depends on context || report || org @
46 expression E;
47 position p;
48 @@
49
50 * if (E != NULL)
51 * \(kfree@p\|kvfree@p\|kfree_sensitive@p\|kvfree_sensitive@p\|vfree@p\|
52 * debugfs_remove@p\|debugfs_remove_recursive@p\|
53 * usb_free_urb@p\|kmem_cache_destroy@p\|mempool_destroy@p\|
54 * dma_pool_destroy@p\)(E, ...);
55
56 @script:python depends on org@
57 p << r.p;
58 @@
59
60 cocci.print_main("NULL check before that freeing function is not needed", p)
61
62 @script:python depends on report@
63 p << r.p;
64 @@
65
66 msg = "WARNING: NULL check before some freeing functions is not needed."
67 coccilib.report.print_report(p[0], msg)
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.