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lock.c: Check *lt before dereferencing it

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*lt is NULL if t->tracking == 0

ASTERISK-25948 #close

Change-Id: I4a81af28f9c82a74aa82413d772a7dc8fa6f45ba
This commit is contained in:
Diederik de Groot
2016-04-21 15:26:47 +02:00
committed by Richard Mudgett
parent cc9b72208f
commit c991e5472e
1 changed files with 9 additions and 7 deletions
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16
main/lock.c
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@@ -286,17 +286,19 @@ int __ast_pthread_mutex_lock(const char *filename, int lineno, const char *func,
if (wait_time > reported_wait && (wait_time % 5) == 0) {
__ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for mutex '%s'?\n",
filename, lineno, func, (int) wait_time, mutex_name);
ast_reentrancy_lock(lt);
if (lt) {
ast_reentrancy_lock(lt);
#ifdef HAVE_BKTR
__dump_backtrace(&lt->backtrace[lt->reentrancy], canlog);
__dump_backtrace(&lt->backtrace[lt->reentrancy], canlog);
#endif
__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
lt->file[ROFFSET], lt->lineno[ROFFSET],
lt->func[ROFFSET], mutex_name);
__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
lt->file[ROFFSET], lt->lineno[ROFFSET],
lt->func[ROFFSET], mutex_name);
#ifdef HAVE_BKTR
__dump_backtrace(&lt->backtrace[ROFFSET], canlog);
__dump_backtrace(&lt->backtrace[ROFFSET], canlog);
#endif
ast_reentrancy_unlock(lt);
ast_reentrancy_unlock(lt);
}
reported_wait = wait_time;
}
usleep(200);