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fb3f8af4 JL |
1 | /// Find uses of standard freeing functons on values allocated using devm_ |
2 | /// functions. Values allocated using the devm_functions are freed when | |
3 | /// the device is detached, and thus the use of the standard freeing | |
4 | /// function would cause a double free. | |
5 | /// See Documentation/driver-model/devres.txt for more information. | |
6 | /// | |
7 | /// A difficulty of detecting this problem is that the standard freeing | |
8 | /// function might be called from a different function than the one | |
9 | /// containing the allocation function. It is thus necessary to make the | |
10 | /// connection between the allocation function and the freeing function. | |
11 | /// Here this is done using the specific argument text, which is prone to | |
12 | /// false positives. There is no rule for the request_region and | |
13 | /// request_mem_region variants because this heuristic seems to be a bit | |
14 | /// less reliable in these cases. | |
15 | /// | |
16 | // Confidence: Moderate | |
17 | // Copyright: (C) 2011 Julia Lawall, INRIA/LIP6. GPLv2. | |
18 | // Copyright: (C) 2011 Gilles Muller, INRIA/LiP6. GPLv2. | |
19 | // URL: http://coccinelle.lip6.fr/ | |
20 | // Comments: | |
93f14468 | 21 | // Options: --no-includes --include-headers |
fb3f8af4 JL |
22 | |
23 | virtual org | |
24 | virtual report | |
25 | virtual context | |
26 | ||
27 | @r depends on context || org || report@ | |
28 | expression x; | |
29 | @@ | |
30 | ||
31 | ( | |
32 | x = devm_kzalloc(...) | |
33 | | | |
34 | x = devm_request_irq(...) | |
35 | | | |
36 | x = devm_ioremap(...) | |
37 | | | |
38 | x = devm_ioremap_nocache(...) | |
39 | | | |
40 | x = devm_ioport_map(...) | |
41 | ) | |
42 | ||
43 | @pb@ | |
44 | expression r.x; | |
45 | position p; | |
46 | @@ | |
47 | ||
48 | ( | |
49 | * kfree@p(x) | |
50 | | | |
51 | * free_irq@p(x) | |
52 | | | |
53 | * iounmap@p(x) | |
54 | | | |
55 | * ioport_unmap@p(x) | |
56 | ) | |
57 | ||
58 | @script:python depends on org@ | |
59 | p << pb.p; | |
60 | @@ | |
61 | ||
62 | msg="WARNING: invalid free of devm_ allocated data" | |
63 | coccilib.org.print_todo(p[0], msg) | |
64 | ||
65 | @script:python depends on report@ | |
66 | p << pb.p; | |
67 | @@ | |
68 | ||
69 | msg="WARNING: invalid free of devm_ allocated data" | |
70 | coccilib.report.print_report(p[0], msg) | |
71 |