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authorEric Dumazet <eric.dumazet@gmail.com>2009-10-30 05:03:53 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-30 12:25:12 -0700
commit9d410c796067686b1e032d54ce475b7055537138 (patch)
tree4442bdbe4a4be1cce024f2e83a12b7404ef935fa
parent63ca2d74ea4f9c7a7ac082c915609a7b224908e7 (diff)
downloadvexpress-lsk-9d410c796067686b1e032d54ce475b7055537138.tar.gz
net: fix sk_forward_alloc corruption
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>
-rw-r--r--include/linux/skbuff.h2
-rw-r--r--net/core/datagram.c10
-rw-r--r--net/ipv4/udp.c4
-rw-r--r--net/ipv6/udp.c4
-rw-r--r--net/sunrpc/svcsock.c10
5 files changed, 18 insertions, 12 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6aebfceca3e..bcdd6606f46 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1757,6 +1757,8 @@ 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,
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 1c6cf3a1a4f..4ade3011bb3 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -224,6 +224,15 @@ void skb_free_datagram(struct sock *sk, struct sk_buff *skb)
consume_skb(skb);
sk_mem_reclaim_partial(sk);
}
+EXPORT_SYMBOL(skb_free_datagram);
+
+void skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb)
+{
+ lock_sock(sk);
+ skb_free_datagram(sk, skb);
+ release_sock(sk);
+}
+EXPORT_SYMBOL(skb_free_datagram_locked);
/**
* skb_kill_datagram - Free a datagram skbuff forcibly
@@ -752,5 +761,4 @@ unsigned int datagram_poll(struct file *file, struct socket *sock,
EXPORT_SYMBOL(datagram_poll);
EXPORT_SYMBOL(skb_copy_and_csum_datagram_iovec);
EXPORT_SYMBOL(skb_copy_datagram_iovec);
-EXPORT_SYMBOL(skb_free_datagram);
EXPORT_SYMBOL(skb_recv_datagram);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d0d436d6216..0fa9f70e4b1 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -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;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 3a60f12b34e..cf538ed5ef6 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -288,9 +288,7 @@ 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;
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index ccc5e83cae5..1c246a4f491 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -111,7 +111,7 @@ static void svc_release_skb(struct svc_rqst *rqstp)
rqstp->rq_xprt_ctxt = NULL;
dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
- skb_free_datagram(svsk->sk_sk, skb);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
}
}
@@ -578,7 +578,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
"svc: received unknown control message %d/%d; "
"dropping RPC reply datagram\n",
cmh->cmsg_level, cmh->cmsg_type);
- skb_free_datagram(svsk->sk_sk, skb);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
return 0;
}
@@ -588,18 +588,18 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
local_bh_enable();
/* checksum error */
- skb_free_datagram(svsk->sk_sk, skb);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
return 0;
}
local_bh_enable();
- skb_free_datagram(svsk->sk_sk, skb);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
} else {
/* we can use it in-place */
rqstp->rq_arg.head[0].iov_base = skb->data +
sizeof(struct udphdr);
rqstp->rq_arg.head[0].iov_len = len;
if (skb_checksum_complete(skb)) {
- skb_free_datagram(svsk->sk_sk, skb);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
return 0;
}
rqstp->rq_xprt_ctxt = skb;