7f904d7e1f
Based on 1 normalized pattern(s): gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 58 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081207.556988620@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
135 lines
1.8 KiB
Plaintext
135 lines
1.8 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0-only
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/// Find a use after free.
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//# Values of variables may imply that some
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//# execution paths are not possible, resulting in false positives.
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//# Another source of false positives are macros such as
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//# SCTP_DBG_OBJCNT_DEC that do not actually evaluate their argument
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///
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// Confidence: Moderate
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// Copyright: (C) 2010-2012 Nicolas Palix.
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// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.
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// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.
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// URL: http://coccinelle.lip6.fr/
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// Comments:
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// Options: --no-includes --include-headers
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virtual org
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virtual report
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@free@
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expression E;
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position p1;
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@@
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(
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* kfree@p1(E)
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* kzfree@p1(E)
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)
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@print expression@
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constant char [] c;
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expression free.E,E2;
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type T;
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position p;
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identifier f;
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@@
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(
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f(...,c,...,(T)E@p,...)
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E@p == E2
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E@p != E2
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E2 == E@p
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E2 != E@p
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!E@p
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E@p || ...
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)
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@sz@
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expression free.E;
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position p;
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@@
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sizeof(<+...E@p...+>)
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@loop exists@
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expression E;
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identifier l;
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position ok;
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@@
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while (1) { ...
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(
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* kfree@ok(E)
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* kzfree@ok(E)
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)
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... when != break;
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when != goto l;
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when forall
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}
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@r exists@
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expression free.E, subE<=free.E, E2;
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expression E1;
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iterator iter;
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statement S;
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position free.p1!=loop.ok,p2!={print.p,sz.p};
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@@
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(
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* kfree@p1(E,...)
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* kzfree@p1(E,...)
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)
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...
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(
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iter(...,subE,...) S // no use
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list_remove_head(E1,subE,...)
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subE = E2
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subE++
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++subE
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--subE
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subE--
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&subE
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BUG(...)
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BUG_ON(...)
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return_VALUE(...)
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return_ACPI_STATUS(...)
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E@p2 // bad use
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)
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@script:python depends on org@
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p1 << free.p1;
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p2 << r.p2;
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@@
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cocci.print_main("kfree",p1)
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cocci.print_secs("ref",p2)
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@script:python depends on report@
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p1 << free.p1;
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p2 << r.p2;
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@@
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msg = "ERROR: reference preceded by free on line %s" % (p1[0].line)
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coccilib.report.print_report(p2[0],msg)
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