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net: fix sk_forward_alloc corruption

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On UDP sockets, we must call skb_free_datagram() with socket locked,
or risk sk_forward_alloc corruption. This requirement is not respected
in SUNRPC.

Add a convenient helper, skb_free_datagram_locked() and use it in SUNRPC

Reported-by: Francis Moreau <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2009-10-30 05:03:53 +00:00 • committed by David S. Miller
commit 9d410c7960
5 changed files with 18 additions and 12 deletions
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4
net/ipv4/udp.c
View file

@ -999,9 +999,7 @@ try_again:
err = ulen;
out_free:
lock_sock(sk);
skb_free_datagram(sk, skb);
release_sock(sk);
skb_free_datagram_locked(sk, skb);
out:
return err;