sctp: reset ret in again path in sctp_for_each_transport
Commit 97a6ec4ac021 ("rhashtable: Change rhashtable_walk_start to
return void") only initialized ret for the first time, when going
to again path, the next tsp could be NULL. Without resetting ret,
cb_done would be called with tsp as NULL.
A kernel crash was caused by this when running sctpdiag testcase
in sctp-tests.
Note that this issue doesn't affect net.git yet.
Fixes: 97a6ec4ac021 ("rhashtable: Change rhashtable_walk_start to return void")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 7ff444e..a40fa53 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4860,9 +4860,10 @@ int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
struct net *net, int *pos, void *p) {
struct rhashtable_iter hti;
struct sctp_transport *tsp;
- int ret = 0;
+ int ret;
again:
+ ret = 0;
sctp_transport_walk_start(&hti);
tsp = sctp_transport_get_idx(net, &hti, *pos + 1);