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perf bench: Fix NULL pointer dereference in "perf bench all"

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The for_each_bench() macro 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 this NULL pointer dereference when running "perf bench all":

  [root@ssdandy ~]# perf bench all
  <SNIP>

  # Running mem/memset benchmark...
  # Copying 1MB Bytes ...

         2.453675 GB/Sec
        12.056327 GB/Sec (with prefault)

  Segmentation fault (core dumped)
  [root@ssdandy ~]#

Signed-off-by: Patrick Palka <patrick@parcs.ath.cx>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1394664051-6037-1-git-send-email-patrick@parcs.ath.cx
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Patrick Palka 2014-03-12 18:40:51 -04:00 committed by Arnaldo Carvalho de Melo
parent 0fae799e86
commit 6eeefccdcf
1 changed files with 1 additions and 1 deletions
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2
tools/perf/builtin-bench.c
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@ -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)
{