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authorRavi Bangoria <ravi.bangoria@linux.ibm.com>2018-06-25 15:42:20 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-06-25 17:59:37 +0300
commit92ead7ee30c80f8852d28735cbcb9d79bc85f715 (patch)
treec0ba6baeb43852f95f77f33b2f993e55e5f2e30c /tools/perf/builtin-report.c
parenta3af66f51bd0bca72881ead4bf2bd19cb366582b (diff)
downloadlinux-92ead7ee30c80f8852d28735cbcb9d79bc85f715.tar.xz
perf tools: Fix crash caused by accessing feat_ops[HEADER_LAST_FEATURE]
perf_event__process_feature() accesses feat_ops[HEADER_LAST_FEATURE] which is not defined and thus perf is crashing. HEADER_LAST_FEATURE is used as an end marker for the perf report but it's unused for perf script/annotate. Ignore HEADER_LAST_FEATURE for perf script/annotate, just like it is done in 'perf report'. Before: # perf record -o - ls | perf script <SNIP 'ls' output> Segmentation fault (core dumped) # After: # perf record -o - ls | perf script <SNIP 'ls' output> Segmentation fault (core dumped) ls 7031 4392.099856: 250000 cpu-clock:uhH: 7f5e0ce7cd60 ls 7031 4392.100355: 250000 cpu-clock:uhH: 7f5e0c706ef7 # Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: David Carrillo-Cisneros <davidcc@google.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Fixes: 57b5de463925 ("perf report: Support forced leader feature in pipe mode") Link: http://lkml.kernel.org/r/20180625124220.6434-4-ravi.bangoria@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-report.c')
-rw-r--r--tools/perf/builtin-report.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index cdb5b6949832..c04dc7b53797 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -217,7 +217,8 @@ static int process_feature_event(struct perf_tool *tool,
}
/*
- * All features are received, we can force the
+ * (feat_id = HEADER_LAST_FEATURE) is the end marker which
+ * means all features are received, now we can force the
* group if needed.
*/
setup_forced_leader(rep, session->evlist);