perf/arm: Fix armpmu_map_hw_event()

Fix constraint check in armpmu_map_hw_event(). Reported-and-tested-by: Vince Weaver <[email protected]> Cc: <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kishon · Aug 13, 2013 · b88a259 · b88a259
1 parent e0acd0a
commit b88a259
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
@@ -53,7 +53,12 @@ armpmu_map_cache_event(const unsigned (*cache_map)
 static int
 armpmu_map_hw_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 -ENOENT;
+
+	mapping = (*event_map)[config];
 	return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
 }