* [PATCH] perf: cs-etm: Fix segfault in dso lookup
@ 2023-04-18 14:12 ` James Clark
0 siblings, 0 replies; 4+ messages in thread
From: James Clark @ 2023-04-18 14:12 UTC (permalink / raw)
To: linux-perf-users, acme
Cc: James Clark, Mathieu Poirier, Suzuki K Poulose, Mike Leach,
Leo Yan, John Garry, Will Deacon, Peter Zijlstra, Ingo Molnar,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Ian Rogers, Adrian Hunter, coresight, linux-arm-kernel,
linux-kernel
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(-)
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
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH] perf: cs-etm: Fix segfault in dso lookup
@ 2023-04-18 14:12 ` James Clark
0 siblings, 0 replies; 4+ messages in thread
From: James Clark @ 2023-04-18 14:12 UTC (permalink / raw)
To: linux-perf-users, acme
Cc: James Clark, Mathieu Poirier, Suzuki K Poulose, Mike Leach,
Leo Yan, John Garry, Will Deacon, Peter Zijlstra, Ingo Molnar,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Ian Rogers, Adrian Hunter, coresight, linux-arm-kernel,
linux-kernel
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(-)
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
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] perf: cs-etm: Fix segfault in dso lookup
2023-04-18 14:12 ` James Clark
@ 2023-04-18 15:26 ` Arnaldo Carvalho de Melo
-1 siblings, 0 replies; 4+ messages in thread
From: Arnaldo Carvalho de Melo @ 2023-04-18 15:26 UTC (permalink / raw)
To: James Clark
Cc: linux-perf-users, Mathieu Poirier, Suzuki K Poulose, Mike Leach,
Leo Yan, John Garry, Will Deacon, Peter Zijlstra, Ingo Molnar,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Ian Rogers, Adrian Hunter, coresight, linux-arm-kernel,
linux-kernel
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
>
--
- Arnaldo
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] perf: cs-etm: Fix segfault in dso lookup
@ 2023-04-18 15:26 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 4+ messages in thread
From: Arnaldo Carvalho de Melo @ 2023-04-18 15:26 UTC (permalink / raw)
To: James Clark
Cc: linux-perf-users, Mathieu Poirier, Suzuki K Poulose, Mike Leach,
Leo Yan, John Garry, Will Deacon, Peter Zijlstra, Ingo Molnar,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Ian Rogers, Adrian Hunter, coresight, linux-arm-kernel,
linux-kernel
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
>
--
- Arnaldo
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-04-18 14:12 [PATCH] perf: cs-etm: Fix segfault in dso lookup James Clark
2023-04-18 14:12 ` James Clark
2023-04-18 15:26 ` Arnaldo Carvalho de Melo
2023-04-18 15:26 ` Arnaldo Carvalho de Melo
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