diff mbox series

perf: cs-etm: Fix segfault in dso lookup

Message ID 20230418141203.673465-1-james.clark@arm.com (mailing list archive)
State New, archived
Headers show
Series perf: cs-etm: Fix segfault in dso lookup | expand

Commit Message

James Clark April 18, 2023, 2:12 p.m. UTC
map__dso() is called before thread__find_map() which always results in a
null pointer dereference. Fix it by finding first, then checking if it
exists.

Fixes: 63df0e4bc368 ("perf map: Add accessor for dso")
Signed-off-by: James Clark <james.clark@arm.com>
---
 tools/perf/util/cs-etm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Arnaldo Carvalho de Melo April 18, 2023, 3:26 p.m. UTC | #1
Em Tue, Apr 18, 2023 at 03:12:03PM +0100, James Clark escreveu:
> map__dso() is called before thread__find_map() which always results in a
> null pointer dereference. Fix it by finding first, then checking if it
> exists.
> 
> Fixes: 63df0e4bc368 ("perf map: Add accessor for dso")

Thanks, applied, checking if another such pattern slipped by in that
cset.

- Arnaldo

> Signed-off-by: James Clark <james.clark@arm.com>
> ---
>  tools/perf/util/cs-etm.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
> index 103865968700..8dd81ddd9e4e 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -885,9 +885,11 @@ static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id,
>  		thread = etmq->etm->unknown_thread;
>  	}
>  
> -	dso = map__dso(al.map);
> +	if (!thread__find_map(thread, cpumode, address, &al))
> +		return 0;
>  
> -	if (!thread__find_map(thread, cpumode, address, &al) || !dso)
> +	dso = map__dso(al.map);
> +	if (!dso)
>  		return 0;
>  
>  	if (dso->data.status == DSO_DATA_STATUS_ERROR &&
> -- 
> 2.34.1
>
diff mbox series

Patch

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 103865968700..8dd81ddd9e4e 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -885,9 +885,11 @@  static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id,
 		thread = etmq->etm->unknown_thread;
 	}
 
-	dso = map__dso(al.map);
+	if (!thread__find_map(thread, cpumode, address, &al))
+		return 0;
 
-	if (!thread__find_map(thread, cpumode, address, &al) || !dso)
+	dso = map__dso(al.map);
+	if (!dso)
 		return 0;
 
 	if (dso->data.status == DSO_DATA_STATUS_ERROR &&