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authorWill Deacon <will.deacon@arm.com>2013-08-20 11:47:39 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-29 09:47:36 -0700
commit975a3cd4cc0dff06a635cb16b8fb25fd3ae88234 (patch)
tree81276d59fd3d7aaf454cd7b8302f834400d17beb
parent805eea0bb13dfded98c2383139b64d0576838b65 (diff)
arm64: perf: fix array out of bounds access in armpmu_map_hw_event()
commit 868f6fea8fa63f09acbfa93256d0d2abdcabff79 upstream. This is a port of d9f966357b14 ("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. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/arm64/kernel/perf_event.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 9ba33c40cdf8..2012646fb46f 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -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;
}