54c056280e
Find missing unlocks. This semantic match considers the specific case where the unlock is missing from an if branch, and there is a lock before the if and an unlock after the if. False positives are due to cases where the if branch represents a case where the function is supposed to exit with the lock held, or where there is some preceding function call that releases the lock. Signed-off-by: Nicolas Palix <npalix@diku.dk> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Michal Marek <mmarek@suse.cz>
96 lines
1.7 KiB
Plaintext
96 lines
1.7 KiB
Plaintext
/// Find missing unlocks. This semantic match considers the specific case
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/// where the unlock is missing from an if branch, and there is a lock
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/// before the if and an unlock after the if. False positives are due to
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/// cases where the if branch represents a case where the function is
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/// supposed to exit with the lock held, or where there is some preceding
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/// function call that releases the lock.
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///
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// Confidence: Moderate
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// Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2.
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// Copyright: (C) 2010 Julia Lawall, DIKU. GPLv2.
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// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. GPLv2.
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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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@prelocked@
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position p1,p;
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expression E1;
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@@
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(
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mutex_lock@p1
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mutex_trylock@p1
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spin_lock@p1
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spin_trylock@p1
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read_lock@p1
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read_trylock@p1
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write_lock@p1
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write_trylock@p1
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read_lock_irq@p1
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write_lock_irq@p1
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read_lock_irqsave@p1
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write_lock_irqsave@p1
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spin_lock_irq@p1
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spin_lock_irqsave@p1
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) (E1@p,...);
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@looped@
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position r;
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@@
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for(...;...;...) { <+... return@r ...; ...+> }
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@err@
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expression E1;
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position prelocked.p;
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position up != prelocked.p1;
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position r!=looped.r;
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identifier lock,unlock;
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@@
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lock(E1@p,...);
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<+... when != E1
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if (...) {
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... when != E1
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return@r ...;
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}
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...+>
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unlock@up(E1,...);
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@script:python depends on org@
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p << prelocked.p1;
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lock << err.lock;
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unlock << err.unlock;
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p2 << err.r;
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@@
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cocci.print_main(lock,p)
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cocci.print_secs(unlock,p2)
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@script:python depends on report@
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p << prelocked.p1;
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lock << err.lock;
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unlock << err.unlock;
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p2 << err.r;
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@@
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msg = "preceding lock on line %s" % (p[0].line)
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coccilib.report.print_report(p2[0],msg)
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