From: Matt Johnston Date: Thu, 14 Oct 2021 08:10:50 +0000 (+0800) Subject: mctp: Avoid leak of mctp_sk_key X-Git-Tag: v6.6.17~8953^2~187 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0b93aed2842d950e8d2625e975e5a57febeff33d;p=platform%2Fkernel%2Flinux-rpi.git mctp: Avoid leak of mctp_sk_key mctp_key_alloc() returns a key already referenced. The mctp_route_input() path receives a packet for a bind socket and allocates a key. It passes the key to mctp_key_add() which takes a refcount and adds the key to lists. mctp_route_input() should then release its own refcount when setting the key pointer to NULL. In the mctp_alloc_local_tag() path (for mctp_local_output()) we similarly need to unref the key before returning (mctp_reserve_tag() takes a refcount and adds the key to lists). Fixes: 73c618456dc5 ("mctp: locking, lifetime and validity changes for sk_keys") Signed-off-by: Matt Johnston Reviewed-by: Jeremy Kerr Signed-off-by: David S. Miller --- diff --git a/net/mctp/route.c b/net/mctp/route.c index 0478145..82fb5ae 100644 --- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -372,6 +372,7 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb) trace_mctp_key_acquire(key); /* we don't need to release key->lock on exit */ + mctp_key_unref(key); key = NULL; } else { @@ -584,6 +585,9 @@ static int mctp_alloc_local_tag(struct mctp_sock *msk, trace_mctp_key_acquire(key); *tagp = key->tag; + /* done with the key in this scope */ + mctp_key_unref(key); + key = NULL; rc = 0; }