Edit File: mini_lock.cocci
/// 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. /// // Confidence: Moderate // Copyright: (C) 2010-2012 Nicolas Palix. GPLv2. // Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6. GPLv2. // Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6. GPLv2. // URL: http://coccinelle.lip6.fr/ // Comments: // Options: -no_includes -include_headers virtual context virtual org virtual report @prelocked@ position p1,p; expression E1; @@ ( mutex_lock@p1 | mutex_trylock@p1 | spin_lock@p1 | spin_trylock@p1 | read_lock@p1 | read_trylock@p1 | write_lock@p1 | write_trylock@p1 | read_lock_irq@p1 | write_lock_irq@p1 | read_lock_irqsave@p1 | write_lock_irqsave@p1 | spin_lock_irq@p1 | spin_lock_irqsave@p1 ) (E1@p,...); @looped@ position r; @@ for(...;...;...) { <+... return@r ...; ...+> } @err exists@ expression E1; position prelocked.p; position up != prelocked.p1; position r!=looped.r; identifier lock,unlock; @@ *lock(E1@p,...); <+... when != E1 if (...) { ... when != E1 * return@r ...; } ...+> *unlock@up(E1,...); @script:python depends on org@ p << prelocked.p1; lock << err.lock; unlock << err.unlock; p2 << err.r; @@ cocci.print_main(lock,p) cocci.print_secs(unlock,p2) @script:python depends on report@ p << prelocked.p1; lock << err.lock; unlock << err.unlock; p2 << err.r; @@ msg = "preceding lock on line %s" % (p[0].line) coccilib.report.print_report(p2[0],msg)