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[IPV6]: Fix illegal dst locking in softirq context.

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On Tue, Jan 31, 2006 at 10:24:32PM +0100, Ingo Molnar wrote:
>
>  [<c04de9e8>] _write_lock+0x8/0x10
>  [<c0499015>] inet6_destroy_sock+0x25/0x100
>  [<c04b8672>] tcp_v6_destroy_sock+0x12/0x20
>  [<c046bbda>] inet_csk_destroy_sock+0x4a/0x150
>  [<c047625c>] tcp_rcv_state_process+0xd4c/0xdd0
>  [<c047d8e9>] tcp_v4_do_rcv+0xa9/0x340
>  [<c047eabb>] tcp_v4_rcv+0x8eb/0x9d0

OK this is definitely broken.  We should never touch the dst lock in
softirq context.  Since inet6_destroy_sock may be called from that
context due to the asynchronous nature of sockets, we can't take the
lock there.

In fact this sk_dst_reset is totally redundant since all IPv6 sockets
use inet_sock_destruct as their socket destructor which always cleans
up the dst anyway.  So the solution is to simply remove the call.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-02-02 17:01:13 -08:00 committed by David S. Miller
parent f8addb3215
commit 6f4b6ec1cf
1 changed files with 0 additions and 6 deletions
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6
net/ipv6/af_inet6.c
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@ -369,12 +369,6 @@ int inet6_destroy_sock(struct sock *sk)
struct sk_buff *skb;
struct ipv6_txoptions *opt;
/*
* Release destination entry
*/
sk_dst_reset(sk);
/* Release rx options */
if ((skb = xchg(&np->pktoptions, NULL)) != NULL)