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net: fix sk_forward_alloc corruption

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[ Upstream commit: 9d410c796067686b1e032d54ce475b7055537138 ]

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 <francis.moro@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric Dumazet
2009-11-15 20:50:00 -08:00
committed by Greg Kroah-Hartman
parent fb97d3d0b3
commit 5213d268cc
5 changed files with 18 additions and 12 deletions
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2
include/linux/skbuff.h
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@@ -1761,6 +1761,8 @@ extern int skb_copy_datagram_const_iovec(const struct sk_buff *from,
int to_offset,
int size);
extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb);
extern void skb_free_datagram_locked(struct sock *sk,
struct sk_buff *skb);
extern int skb_kill_datagram(struct sock *sk, struct sk_buff *skb,
unsigned int flags);
extern __wsum skb_checksum(const struct sk_buff *skb, int offset,