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* [PATCH] perf tools: Check for null when copying nsinfo.
@ 2018-08-09 21:53 Benno Evers
  2018-08-10  4:55 ` Namhyung Kim
  0 siblings, 1 reply; 4+ messages in thread
From: Benno Evers @ 2018-08-09 21:53 UTC (permalink / raw)
  To: Krister Johansen
  Cc: Benno Evers, Peter Zijlstra, Ingo Molnar,
	Arnaldo Carvalho de Melo, Alexander Shishkin, Jiri Olsa,
	Namhyung Kim, linux-kernel

The argument to nsinfo__copy() was assumed to be valid, but some code paths
exist that will lead to NULL being passed.

In particular, running 'perf script -D' on a perf.data file containing an
PERF_RECORD_MMAP event associating the '[vdso]' dso with pid 0 earlier in
the event stream will lead to a segfault.

Since all calling code is already checking for a non-null return value,
just return NULL for this case as well.
---
 tools/perf/util/namespaces.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/namespaces.c b/tools/perf/util/namespaces.c
index 5be021701f34..cf8bd123cf73 100644
--- a/tools/perf/util/namespaces.c
+++ b/tools/perf/util/namespaces.c
@@ -139,6 +139,9 @@ struct nsinfo *nsinfo__copy(struct nsinfo *nsi)
 {
 	struct nsinfo *nnsi;
 
+	if (nsi == NULL)
+		return NULL;
+
 	nnsi = calloc(1, sizeof(*nnsi));
 	if (nnsi != NULL) {
 		nnsi->pid = nsi->pid;
-- 
2.17.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

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2018-08-09 21:53 [PATCH] perf tools: Check for null when copying nsinfo Benno Evers
2018-08-10  4:55 ` Namhyung Kim
2018-08-10 13:18   ` Arnaldo Carvalho de Melo
2018-08-10 13:38     ` Benno Evers

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