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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-04-06 10:49:10 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-06 05:07:21 -0400 |
| commit | 110c43304db6f06490961529536c362d9ac5732f (patch) | |
| tree | 5729bd4310cffaea7d0e4fbe3451d26e78271179 | |
| parent | 4a7e7c2ad540e54c75489a70137bf0ec15d3a127 (diff) | |
| download | linux-stable-110c43304db6f06490961529536c362d9ac5732f.tar.gz linux-stable-110c43304db6f06490961529536c362d9ac5732f.tar.bz2 linux-stable-110c43304db6f06490961529536c362d9ac5732f.zip | |
net: fix a race in sock_queue_err_skb()
As soon as an skb is queued into socket error queue, another thread
can consume it, so we are not allowed to reference skb anymore, or risk
use after free.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/skbuff.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index f223cdc75da6..baf8d281152c 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3161,6 +3161,8 @@ static void sock_rmem_free(struct sk_buff *skb) */ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) { + int len = skb->len; + if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= (unsigned)sk->sk_rcvbuf) return -ENOMEM; @@ -3175,7 +3177,7 @@ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) skb_queue_tail(&sk->sk_error_queue, skb); if (!sock_flag(sk, SOCK_DEAD)) - sk->sk_data_ready(sk, skb->len); + sk->sk_data_ready(sk, len); return 0; } EXPORT_SYMBOL(sock_queue_err_skb); |