From: Leo Yan <leo....@linaro.org>

Robert Walker reported a segmentation fault is observed when process
CoreSight trace data; this issue can be easily reproduced by the command
'perf report --itrace=i1000i' for decoding tracing data.

If neither the 'b' flag (synthesize branches events) nor 'l' flag
(synthesize last branch entries) are specified to option '--itrace',
cs_etm_queue::prev_packet will not been initialised.  After merging the
code to support exception packets and sample flags, there introduced a
number of uses of cs_etm_queue::prev_packet without checking whether it
is valid, for these cases any accessing to uninitialised prev_packet
will cause crash.

As cs_etm_queue::prev_packet is used more widely now and it's already
hard to follow which functions have been called in a context where the
validity of cs_etm_queue::prev_packet has been checked, this patch
always allocates memory for cs_etm_queue::prev_packet.

Reported-by: Robert Walker <robert.wal...@arm.com>
Suggested-by: Robert Walker <robert.wal...@arm.com>
Signed-off-by: Leo Yan <leo....@linaro.org>
Tested-by: Robert Walker <robert.wal...@arm.com>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Mathieu Poirier <mathieu.poir...@linaro.org>
Cc: Mike Leach <mike.le...@linaro.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Suzuki K Poulouse <suzuki.poul...@arm.com>
Cc: linux-arm-ker...@lists.infradead.org
Fixes: 7100b12cf474 ("perf cs-etm: Generate branch sample for exception packet")
Fixes: 24fff5eb2b93 ("perf cs-etm: Avoid stale branch samples when flush 
packet")
Link: http://lkml.kernel.org/r/20190428083228.20246-1-leo....@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/perf/util/cs-etm.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 7777cfc1ad8c..de488b43f440 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -422,11 +422,9 @@ static struct cs_etm_queue *cs_etm__alloc_queue(struct 
cs_etm_auxtrace *etm)
        if (!etmq->packet)
                goto out_free;
 
-       if (etm->synth_opts.last_branch || etm->sample_branches) {
-               etmq->prev_packet = zalloc(szp);
-               if (!etmq->prev_packet)
-                       goto out_free;
-       }
+       etmq->prev_packet = zalloc(szp);
+       if (!etmq->prev_packet)
+               goto out_free;
 
        if (etm->synth_opts.last_branch) {
                size_t sz = sizeof(struct branch_stack);
-- 
2.20.1

Reply via email to