From: Leo Yan leo.yan@linaro.org
[ Upstream commit b14585d9f18dc617e975815570fe836be656b1da ]
In the function auxtrace_parse_snapshot_options(), the callback pointer "itr->parse_snapshot_options" can be NULL if it has not been set during the AUX record initialization. This can cause tool crashing if the callback pointer "itr->parse_snapshot_options" is dereferenced without performing NULL check.
Add a NULL check for the pointer "itr->parse_snapshot_options" before invoke the callback.
Fixes: d20031bb63dd6dde ("perf tools: Add AUX area tracing Snapshot Mode") Signed-off-by: Leo Yan leo.yan@linaro.org Acked-by: Adrian Hunter adrian.hunter@intel.com Cc: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Andi Kleen ak@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Tiezhu Yang yangtiezhu@loongson.cn Link: http://lore.kernel.org/lkml/20210420151554.2031768-1-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/auxtrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index 2723082f3817..e7a071a15470 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -634,7 +634,7 @@ int auxtrace_parse_snapshot_options(struct auxtrace_record *itr, break; }
- if (itr) + if (itr && itr->parse_snapshot_options) return itr->parse_snapshot_options(itr, opts, str);
pr_err("No AUX area tracing to snapshot\n");