linux-kernel - [tip: perf/core] perf callchain: Fix segfault in thread__resolve_callchain

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Date:   Tue, 19 Nov 2019 16:56:49 -0000
From:   "tip-bot2 for Adrian Hunter" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf callchain: Fix segfault in
 thread__resolve_callchain_sample()

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     aceb98261ea7d9fe38f9c140c5531f0b13623832
Gitweb:        https://git.kernel.org/tip/aceb98261ea7d9fe38f9c140c5531f0b13623832
Author:        Adrian Hunter <adrian.hunter@...el.com>
AuthorDate:    Thu, 14 Nov 2019 16:25:38 +02:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Mon, 18 Nov 2019 13:01:59 -03:00

perf callchain: Fix segfault in thread__resolve_callchain_sample()

Do not dereference 'chain' when it is NULL.

  $ perf record -e intel_pt//u -e branch-misses:u uname
  $ perf report --itrace=l --branch-history
  perf: Segmentation fault

Fixes: e9024d519d89 ("perf callchain: Honour the ordering of PERF_CONTEXT_{USER,KERNEL,etc}")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lore.kernel.org/lkml/20191114142538.4097-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/machine.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 7d2e211..71ee078 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2385,7 +2385,7 @@ static int thread__resolve_callchain_sample(struct thread *thread,
 	}
 
 check_calls:
-	if (callchain_param.order != ORDER_CALLEE) {
+	if (chain && callchain_param.order != ORDER_CALLEE) {
 		err = find_prev_cpumode(chain, thread, cursor, parent, root_al,
 					&cpumode, chain->nr - first_call);
 		if (err)