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| author | Eric Dumazet | 2015-04-24 03:03:44 +0200 |
|---|---|---|
| committer | David S. Miller | 2015-04-24 17:39:15 +0200 |
| commit | b357a364c57c940ddb932224542494363df37378 (patch) | |
| tree | 84657c956c5c64a2ae058b8285271f778b1aea67 /net/dccp/ipv6.c | |
| parent | rhashtable: don't attempt to grow when at max_size (diff) | |
| download | kernel-qcow2-linux-b357a364c57c940ddb932224542494363df37378.tar.gz kernel-qcow2-linux-b357a364c57c940ddb932224542494363df37378.tar.xz kernel-qcow2-linux-b357a364c57c940ddb932224542494363df37378.zip | |
inet: fix possible panic in reqsk_queue_unlink()
[ 3897.923145] BUG: unable to handle kernel NULL pointer dereference at
0000000000000080
[ 3897.931025] IP: [<ffffffffa9f27686>] reqsk_timer_handler+0x1a6/0x243
There is a race when reqsk_timer_handler() and tcp_check_req() call
inet_csk_reqsk_queue_unlink() on the same req at the same time.
Before commit fa76ce7328b2 ("inet: get rid of central tcp/dccp listener
timer"), listener spinlock was held and race could not happen.
To solve this bug, we change reqsk_queue_unlink() to not assume req
must be found, and we return a status, to conditionally release a
refcount on the request sock.
This also means tcp_check_req() in non fastopen case might or not
consume req refcount, so tcp_v6_hnd_req() & tcp_v4_hnd_req() have
to properly handle this.
(Same remark for dccp_check_req() and its callers)
inet_csk_reqsk_queue_drop() is now too big to be inlined, as it is
called 4 times in tcp and 3 times in dccp.
Fixes: fa76ce7328b2 ("inet: get rid of central tcp/dccp listener timer")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/ipv6.c')
| -rw-r--r-- | net/dccp/ipv6.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index 9d0551092c6c..5165571f397a 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -301,7 +301,8 @@ static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) &iph->daddr, inet6_iif(skb)); if (req) { nsk = dccp_check_req(sk, skb, req); - reqsk_put(req); + if (!nsk) + reqsk_put(req); return nsk; } nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |