Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [PATCH] perf hists browser: Fix segfault if use symbol filter in cmdline | Date | Wed, 2 Dec 2015 11:28:52 +0000 |
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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 faluse when selection is NULL.
Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> --- tools/perf/ui/browsers/hists.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c index dcdcbaf..33da341 100644 --- a/tools/perf/ui/browsers/hists.c +++ b/tools/perf/ui/browsers/hists.c @@ -337,9 +337,12 @@ static bool hist_browser__toggle_fold(struct hist_browser *browser) { struct hist_entry *he = browser->he_selection; struct map_symbol *ms = browser->selection; - struct callchain_list *cl = container_of(ms, struct callchain_list, ms); + struct callchain_list *cl = ms ? container_of(ms, struct callchain_list, ms) : NULL; 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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