4.18-stable review patch. If anyone has any objections, please let me know.
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From: Benno Evers bevers@mesosphere.com
[ Upstream commit 3f4417d693b43fa240ac8bde4487f67745ca23d8 ]
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.
Signed-off-by: Benno Evers bevers@mesosphere.com Acked-by: Namhyung Kim namhyung@kernel.org Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Krister Johansen kjlx@templeofstupid.com Cc: Peter Zijlstra peterz@infradead.org Link: http://lkml.kernel.org/r/20180810133614.9925-1-bevers@mesosphere.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/util/namespaces.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/tools/perf/util/namespaces.c +++ b/tools/perf/util/namespaces.c @@ -139,6 +139,9 @@ struct nsinfo *nsinfo__copy(struct nsinf { struct nsinfo *nnsi;
+ if (nsi == NULL) + return NULL; + nnsi = calloc(1, sizeof(*nnsi)); if (nnsi != NULL) { nnsi->pid = nsi->pid;