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
12virtual patch
13virtual org
14virtual report
15virtual context
16
17@r2 depends on patch@
18expression 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 @
46expression E;
47position 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@
57p << r.p;
58@@
59
60cocci.print_main("NULL check before that freeing function is not needed", p)
61
62@script:python depends on report@
63p << r.p;
64@@
65
66msg = "WARNING: NULL check before some freeing functions is not needed."
67coccilib.report.print_report(p[0], msg)