Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 1/8] perf, tool: Fix NULL deref in hists browsing code | Date | Wed, 4 Apr 2012 22:21:31 +0200 |
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If there's an event with no samples in data file, the perf report command can segfault after entering the event details menu.
Following steps reproduce the issue:
# ./perf record -e syscalls:sys_enter_kexec_load,syscalls:sys_enter_mmap ls # ./perf report # enter '0 syscalls:sys_enter_kexec_load' menu # pres ENTER twice
Above steps are valid assuming ls wont run kexec.. ;)
The check for sellection to be NULL is missing. The fix makes sure it's being check. Above steps now endup with menu being displayed allowing 'Exit' as the only option.
Signed-off-by: Jiri Olsa <jolsa@redhat.com> --- tools/perf/util/ui/browsers/hists.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c index d7a1c4a..2f83e5d 100644 --- a/tools/perf/util/ui/browsers/hists.c +++ b/tools/perf/util/ui/browsers/hists.c @@ -125,6 +125,9 @@ static int callchain__count_rows(struct rb_root *chain) static bool map_symbol__toggle_fold(struct map_symbol *self) { + if (!self) + return false; + if (!self->has_children) return false; -- 1.7.7.6
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