1/// NULL check before some freeing functions is not needed.
2///
3/// Based on checkpatch warning
4/// "kfree(NULL) is safe this check is probably not required"
5/// and kfreeaddr.cocci by Julia Lawall.
6///
7// Copyright: (C) 2014 Fabian Frederick.  GPLv2.
8// Comments: -
9// Options: --no-includes --include-headers
10
11virtual patch
12virtual org
13virtual report
14virtual context
15
16@r2 depends on patch@
17expression E;
18@@
19- if (E != NULL)
20(
21  kfree(E);
22|
23  debugfs_remove(E);
24|
25  debugfs_remove_recursive(E);
26|
27  usb_free_urb(E);
28|
29  kmem_cache_destroy(E);
30|
31  mempool_destroy(E);
32|
33  dma_pool_destroy(E);
34)
35
36@r depends on context || report || org @
37expression E;
38position p;
39@@
40
41* if (E != NULL)
42*	\(kfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\|
43*         usb_free_urb@p\|kmem_cache_destroy@p\|mempool_destroy@p\|
44*         dma_pool_destroy@p\)(E);
45
46@script:python depends on org@
47p << r.p;
48@@
49
50cocci.print_main("NULL check before that freeing function is not needed", p)
51
52@script:python depends on report@
53p << r.p;
54@@
55
56msg = "WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values."
57coccilib.report.print_report(p[0], msg)
58