linux-kernel - [PATCH] perf bench: Fix NULL pointer dereference in "perf bench all"

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Message-Id: <1394664051-6037-1-git-send-email-patrick@parcs.ath.cx>
Date:	Wed, 12 Mar 2014 18:40:51 -0400
From:	Patrick Palka <patrick@...cs.ath.cx>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...stprotocols.net, mingo@...hat.com, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, Patrick Palka <patrick@...cs.ath.cx>
Subject: [PATCH] perf bench: Fix NULL pointer dereference in "perf bench all"

for_each_bench() must check that the "benchmarks" field of a collection
is not NULL before dereferencing it because the "all" collection in
particular has a NULL "benchmarks" field (signifying that it has no
benchmarks to iterate over).

This fixes a NULL pointer dereference when running "perf bench all".

Signed-off-by: Patrick Palka <patrick@...cs.ath.cx>
---
 tools/perf/builtin-bench.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index e47f90c..8a987d2 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -76,7 +76,7 @@ static struct collection collections[] = {
 
 /* Iterate over all benchmarks within a collection: */
 #define for_each_bench(coll, bench) \
-	for (bench = coll->benchmarks; bench->name; bench++)
+	for (bench = coll->benchmarks; bench && bench->name; bench++)
 
 static void dump_benchmarks(struct collection *coll)
 {
-- 
1.9.0

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