* [PATCH] perf auxtrace: Fix potential null pointer dereference
@ 2021-04-20 15:15 Leo Yan
2021-04-20 15:51 ` Adrian Hunter
0 siblings, 1 reply; 2+ messages in thread
From: Leo Yan @ 2021-04-20 15:15 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo, Adrian Hunter, Peter Zijlstra,
Ingo Molnar, Mark Rutland, Alexander Shishkin, Jiri Olsa,
Namhyung Kim, Andi Kleen, Tiezhu Yang, linux-kernel
Cc: Leo Yan
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: d20031bb63dd ("perf tools: Add AUX area tracing Snapshot Mode")
Signed-off-by: Leo Yan <leo.yan@linaro.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 953f4afacd3b..320b47f133d3 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -638,7 +638,7 @@ 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");
--
2.25.1
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] perf auxtrace: Fix potential null pointer dereference
2021-04-20 15:15 [PATCH] perf auxtrace: Fix potential null pointer dereference Leo Yan
@ 2021-04-20 15:51 ` Adrian Hunter
0 siblings, 0 replies; 2+ messages in thread
From: Adrian Hunter @ 2021-04-20 15:51 UTC (permalink / raw)
To: Leo Yan, Arnaldo Carvalho de Melo, Peter Zijlstra, Ingo Molnar,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Andi Kleen, Tiezhu Yang, linux-kernel
On 20/04/21 6:15 pm, Leo Yan wrote:
> 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: d20031bb63dd ("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>
> ---
> 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 953f4afacd3b..320b47f133d3 100644
> --- a/tools/perf/util/auxtrace.c
> +++ b/tools/perf/util/auxtrace.c
> @@ -638,7 +638,7 @@ 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");
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-04-20 15:51 ` Adrian Hunter
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