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arm64: perf: fix array out of bounds access in armpmu_map_hw_event()

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This is a port of d9f966357b ("ARM: 7810/1: perf: Fix array out of
bounds access in armpmu_map_hw_event()") to arm64, which fixes an oops
in the arm64 perf backend found as a result of Vince's fuzzing tool.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon 2013-08-20 11:47:39 +01:00 committed by Catalin Marinas
parent c095ba7224
commit 868f6fea8f
1 changed files with 6 additions and 1 deletions
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7
arch/arm64/kernel/perf_event.c
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@ -107,7 +107,12 @@ armpmu_map_cache_event(const unsigned (*cache_map)
static int
armpmu_map_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
{
int mapping = (*event_map)[config];
int mapping;
if (config >= PERF_COUNT_HW_MAX)
return -EINVAL;
mapping = (*event_map)[config];
return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
}