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:
21// Options: --no-includes --include-headers
22
23virtual org
24virtual report
25virtual context
26
27@r depends on context || org || report@
28expression 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@
44expression r.x;
45position 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@
59p << pb.p;
60@@
61
62msg="WARNING: invalid free of devm_ allocated data"
63coccilib.org.print_todo(p[0], msg)
64
65@script:python depends on report@
66p << pb.p;
67@@
68
69msg="WARNING: invalid free of devm_ allocated data"
70coccilib.report.print_report(p[0], msg)
71
72