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Subject[PATCH v2 1/3] perf hists browser: Fix segfault if use symbol filter in cmdline
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If feed perf a symbol filter in cmdline and the result is empty,
pressing 'Enter' in the hist browser causes crash:

# ./perf report perf.data <-- Common mistake for beginners

Then press 'Enter':

perf: Segmentation fault
-------- backtrace --------
/home/wangnan/perf[0x53e578]
/lib64/libc.so.6(+0x3545f)[0x7f76bafe045f]
/home/wangnan/perf[0x539dd4]
/home/wangnan/perf(perf_evlist__tui_browse_hists+0x96)[0x53d216]
/home/wangnan/perf(cmd_report+0x1b9f)[0x442c7f]
/home/wangnan/perf[0x47efa2]
/home/wangnan/perf(main+0x5f5)[0x432fa5]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x7f76bafccbd4]
/home/wangnan/perf[0x4330d4]

This is because 'perf.data' is interperted as a symbol filter, and the
result is empty, so selection is empty. However,
hist_browser__toggle_fold() forgets to check it.

This patch simply return false when selection is NULL.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/ui/browsers/hists.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index dcdcbaf..601a585 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -340,6 +340,9 @@ static bool hist_browser__toggle_fold(struct hist_browser *browser)
struct callchain_list *cl = container_of(ms, struct callchain_list, ms);
bool has_children;

+ if (!ms)
+ return false;
+
if (ms == &he->ms)
has_children = hist_entry__toggle_fold(he);
else
--
1.8.3.4


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