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kfree.cocci

// SPDX-License-Identifier: GPL-2.0-only
/// Find a use after free.
//# Values of variables may imply that some
//# execution paths are not possible, resulting in false positives.
//# Another source of false positives are macros such as
//# SCTP_DBG_OBJCNT_DEC that do not actually evaluate their argument
///
// Confidence: Moderate
// Copyright: (C) 2010-2012 Nicolas Palix.
// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.
// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.
// URL: https://coccinelle.gitlabpages.inria.fr/website
// Comments:
// Options: --no-includes --include-headers

virtual org
virtual report

@free@
expression E;
position p1;
@@

(
 kfree@p1(E)
|
 kfree_sensitive@p1(E)
)

@print expression@
constant char [] c;
expression free.E,E2;
type T;
position p;
identifier f;
@@

(
 f(...,c,...,(T)E@p,...)
|
 E@p == E2
|
 E@p != E2
|
 E2 == E@p
|
 E2 != E@p
|
 !E@p
|
 E@p || ...
)

@sz@
expression free.E;
position p;
@@

sizeof(<+...E@p...+>)

@loop exists@
expression E;
identifier l;
position ok;
@@

while (1) { ...
(
 kfree@ok(E)
|
 kfree_sensitive@ok(E)
)
  ... when != break;
      when != goto l;
      when forall
}

@r exists@
expression free.E, subE<=free.E, E2;
expression E1;
iterator iter;
statement S;
position free.p1!=loop.ok,p2!={print.p,sz.p};
@@

@script:python depends on org@
p1 << free.p1;
p2 << r.p2;
@@

cocci.print_main("kfree",p1)
cocci.print_secs("ref",p2)

@script:python depends on report@
p1 << free.p1;
p2 << r.p2;
@@

msg = "ERROR: reference preceded by free on line %s" % (p1[0].line)
coccilib.report.print_report(p2[0],msg)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-05-16 06:28:31
..	dir	-	root/root	drwxr-xr-x	2025-05-16 06:28:29
clk_put.cocci	text/x-c++	1.27 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
devm_free.cocci	text/x-c++	2.53 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
ifnulldev_put.cocci	text/x-c++	1.06 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
ifnullfree.cocci	text/x-c++	1.29 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
iounmap.cocci	text/x-c++	1.28 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
kfree.cocci	text/x-c++	1.83 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
kfreeaddr.cocci	text/x-c++	646 B	root/root	-rw-r--r--	2024-03-11 02:08:09
pci_free_consistent.cocci	text/x-c++	1.28 KB	root/root	-rw-r--r--	2024-03-11 02:08:09
put_device.cocci	text/x-c++	1.3 KB	root/root	-rw-r--r--	2024-03-11 02:08:09