[PATCH v2] mctp: fix use after free

[trix@redhat.com]

From: Tom Rix <trix@redhat.com>

Clang static analysis reports this problem
route.c:425:4: warning: Use of memory after it is freed
  trace_mctp_key_acquire(key);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
When mctp_key_add() fails, key is freed but then is later
used in trace_mctp_key_acquire().  Add an else statement
to use the key only when mctp_key_add() is successful.

Fixes: 4f9e1ba6de45 ("mctp: Add tracepoints for tag/key handling")
Signed-off-by: Tom Rix <trix@redhat.com>
---
v2: change the Fixes: line

 net/mctp/route.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/mctp/route.c b/net/mctp/route.c
index 17e3482aa770..0c4c56e1bd6e 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -419,13 +419,14 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
 			 * this function.
 			 */
 			rc = mctp_key_add(key, msk);
-			if (rc)
+			if (rc) {
 				kfree(key);
+			} else {
+				trace_mctp_key_acquire(key);
 
-			trace_mctp_key_acquire(key);
-
-			/* we don't need to release key->lock on exit */
-			mctp_key_unref(key);
+				/* we don't need to release key->lock on exit */
+				mctp_key_unref(key);
+			}
 			key = NULL;
 
 		} else {
-- 
2.26.3