Commit-ID: 7d4df089d77306914426a604c890175f91a9a459 Gitweb: http://git.kernel.org/tip/7d4df089d77306914426a604c890175f91a9a459 Author: Milian Wolff <milian.wo...@kdab.com> AuthorDate: Wed, 24 May 2017 15:21:23 +0900 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Wed, 24 May 2017 08:41:47 +0200
perf report: Don't crash on invalid maps in `-g srcline` mode I just hit a segfault when doing `perf report -g srcline`. Valgrind pointed me at this code as the culprit: ==8359== Invalid read of size 8 ==8359== at 0x3096D9: map__rip_2objdump (map.c:430) ==8359== by 0x2FC1A3: match_chain_srcline (callchain.c:645) ==8359== by 0x2FC1A3: match_chain (callchain.c:700) ==8359== by 0x2FC1A3: append_chain (callchain.c:895) ==8359== by 0x2FC1A3: append_chain_children (callchain.c:846) ==8359== by 0x2FF719: callchain_append (callchain.c:944) ==8359== by 0x2FF719: hist_entry__append_callchain (callchain.c:1058) ==8359== by 0x32FA06: iter_add_single_cumulative_entry (hist.c:908) ==8359== by 0x33195C: hist_entry_iter__add (hist.c:1050) ==8359== by 0x258F65: process_sample_event (builtin-report.c:204) ==8359== by 0x30D60C: perf_session__deliver_event (session.c:1310) ==8359== by 0x30D60C: ordered_events__deliver_event (session.c:119) ==8359== by 0x310D12: __ordered_events__flush (ordered-events.c:210) ==8359== by 0x310D12: ordered_events__flush.part.3 (ordered-events.c:277) ==8359== by 0x30DD3C: perf_session__process_user_event (session.c:1349) ==8359== by 0x30DD3C: perf_session__process_event (session.c:1475) ==8359== by 0x30FC3C: __perf_session__process_events (session.c:1867) ==8359== by 0x30FC3C: perf_session__process_events (session.c:1921) ==8359== by 0x25A985: __cmd_report (builtin-report.c:575) ==8359== by 0x25A985: cmd_report (builtin-report.c:1054) ==8359== by 0x2B9A80: run_builtin (perf.c:296) ==8359== Address 0x70 is not stack'd, malloc'd or (recently) free'd This patch fixes the issue. Signed-off-by: Milian Wolff <milian.wo...@kdab.com> [ Remove dependency from another change ] Signed-off-by: Namhyung Kim <namhy...@kernel.org> Cc: Arnaldo Carvalho de Melo <a...@kernel.org> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: David Ahern <dsah...@gmail.com> Cc: Jiri Olsa <jo...@kernel.org> Cc: Jiri Olsa <jo...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Yao Jin <yao....@linux.intel.com> Cc: kernel-t...@lge.com Link: http://lkml.kernel.org/r/20170524062129.32529-2-namhy...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- tools/perf/util/callchain.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 81fc29a..b4204b4 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -621,14 +621,19 @@ enum match_result { static enum match_result match_chain_srcline(struct callchain_cursor_node *node, struct callchain_list *cnode) { - char *left = get_srcline(cnode->ms.map->dso, + char *left = NULL; + char *right = NULL; + enum match_result ret = MATCH_EQ; + int cmp; + + if (cnode->ms.map) + left = get_srcline(cnode->ms.map->dso, map__rip_2objdump(cnode->ms.map, cnode->ip), cnode->ms.sym, true, false); - char *right = get_srcline(node->map->dso, + if (node->map) + right = get_srcline(node->map->dso, map__rip_2objdump(node->map, node->ip), node->sym, true, false); - enum match_result ret = MATCH_EQ; - int cmp; if (left && right) cmp = strcmp(left, right);
