diff options
| author | Matt Johnston <matt@codeconstruct.com.au> | 2021-10-14 11:10:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-10-15 13:22:08 +0300 |
| commit | 0b93aed2842d950e8d2625e975e5a57febeff33d (patch) | |
| tree | 69a36266a237fb8f644c999888d9cf40abd3f450 /net/mctp | |
| parent | bf1366734b362c7da4933760c4f42c278ce843fa (diff) | |
| download | linux-0b93aed2842d950e8d2625e975e5a57febeff33d.tar.xz | |
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 <matt@codeconstruct.com.au>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mctp')
| -rw-r--r-- | net/mctp/route.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/mctp/route.c b/net/mctp/route.c index 04781459b2be..82fb5ae524f6 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; } |