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

[Patrick Palka <patrick@parcs.ath.cx>]

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@parcs.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