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lockdep: Avoid out of bounds array reference in save_trace()

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ia64 found this the hard way (because we currently have a stub
for save_stack_trace() that does nothing). But it would be a
good idea to  be cautious in case a real save_stack_trace()
bailed out with an error before it set trace->nr_entries.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: luming.yu@intel.com
LKML-Reference: <4b2024d085302c2a2@agluck-desktop.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Luck, Tony 2009-12-09 14:29:36 -08:00 committed by Ingo Molnar
parent 722d017237
commit ea5b41f9d5
1 changed files with 2 additions and 1 deletions
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3
kernel/lockdep.c
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@ -386,7 +386,8 @@ static int save_trace(struct stack_trace *trace)
* complete trace that maxes out the entries provided will be reported
* as incomplete, friggin useless </rant>
*/
if (trace->entries[trace->nr_entries-1] == ULONG_MAX)
if (trace->nr_entries != 0 &&
trace->entries[trace->nr_entries-1] == ULONG_MAX)
trace->nr_entries--;
trace->max_entries = trace->nr_entries;