summaryrefslogtreecommitdiffstats
path: root/scripts/coccinelle/free/devm_free.cocci
blob: 0a1e36146d76dcdfa20eb948d0ef4c4f4f941e70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
/// Find uses of standard freeing functons on values allocated using devm_
/// functions.  Values allocated using the devm_functions are freed when
/// the device is detached, and thus the use of the standard freeing
/// function would cause a double free.
/// See Documentation/driver-model/devres.txt for more information.
///
/// A difficulty of detecting this problem is that the standard freeing
/// function might be called from a different function than the one
/// containing the allocation function.  It is thus necessary to make the
/// connection between the allocation function and the freeing function.
/// Here this is done using the specific argument text, which is prone to
/// false positives.  There is no rule for the request_region and
/// request_mem_region variants because this heuristic seems to be a bit
/// less reliable in these cases.
///
// Confidence: Moderate
// Copyright: (C) 2011 Julia Lawall, INRIA/LIP6.  GPLv2.
// Copyright: (C) 2011 Gilles Muller, INRIA/LiP6.  GPLv2.
// URL: http://coccinelle.lip6.fr/
// Comments:
// Options: -no_includes -include_headers

virtual org
virtual report
virtual context

@r depends on context || org || report@
expression x;
@@

(
 x = devm_kzalloc(...)
|
 x = devm_request_irq(...)
|
 x = devm_ioremap(...)
|
 x = devm_ioremap_nocache(...)
|
 x = devm_ioport_map(...)
)

@pb@
expression r.x;
position p;
@@

(
* kfree@p(x)
|
* free_irq@p(x)
|
* iounmap@p(x)
|
* ioport_unmap@p(x)
)

@script:python depends on org@
p << pb.p;
@@

msg="WARNING: invalid free of devm_ allocated data"
coccilib.org.print_todo(p[0], msg)

@script:python depends on report@
p << pb.p;
@@

msg="WARNING: invalid free of devm_ allocated data"
coccilib.report.print_report(p[0], msg)

OpenPOWER on IntegriCloud