Commit | Line | Data |
---|---|---|
791dfeb4 FF |
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 | /// | |
45715f33 FF |
7 | // Copyright: (C) 2014 Fabian Frederick. GPLv2. |
8 | // Comments: - | |
9 | // Options: --no-includes --include-headers | |
791dfeb4 FF |
10 | |
11 | virtual patch | |
12 | virtual org | |
13 | virtual report | |
14 | virtual context | |
15 | ||
16 | @r2 depends on patch@ | |
17 | expression E; | |
18 | @@ | |
ca047e71 | 19 | - if (E != NULL) |
791dfeb4 | 20 | ( |
ca047e71 | 21 | kfree(E); |
791dfeb4 | 22 | | |
ca047e71 | 23 | debugfs_remove(E); |
791dfeb4 | 24 | | |
ca047e71 | 25 | debugfs_remove_recursive(E); |
791dfeb4 | 26 | | |
ca047e71 | 27 | usb_free_urb(E); |
4743775c JL |
28 | | |
29 | kmem_cache_destroy(E); | |
30 | | | |
31 | mempool_destroy(E); | |
32 | | | |
33 | dma_pool_destroy(E); | |
791dfeb4 FF |
34 | ) |
35 | ||
36 | @r depends on context || report || org @ | |
37 | expression E; | |
38 | position p; | |
39 | @@ | |
40 | ||
ca047e71 | 41 | * if (E != NULL) |
4743775c JL |
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); | |
791dfeb4 FF |
45 | |
46 | @script:python depends on org@ | |
47 | p << r.p; | |
48 | @@ | |
49 | ||
50 | cocci.print_main("NULL check before that freeing function is not needed", p) | |
51 | ||
52 | @script:python depends on report@ | |
53 | p << r.p; | |
54 | @@ | |
55 | ||
56 | msg = "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." | |
57 | coccilib.report.print_report(p[0], msg) |