3.16.7-ckt23 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------ From: Luis Henriques <[email protected]> This reverts commit fa89ae5548ed282f0ceb4660b3b93e4e2ee875f3. As reported by Michal Kubecek, the backport of commit 89c22d8c3b27 ("net: Fix skb csum races when peeking") exposed an upstream bug. It is being reverted and replaced by a better fix. Signed-off-by: Luis Henriques <[email protected]> --- include/linux/skbuff.h | 2 +- net/core/datagram.c | 6 +----- net/ipv4/tcp_input.c | 2 +- net/ipv4/udp.c | 2 +- net/ipv6/raw.c | 2 +- net/ipv6/udp.c | 3 +-- 6 files changed, 6 insertions(+), 11 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 94038f93f145..010bc80be91c 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2525,7 +2525,7 @@ unsigned int datagram_poll(struct file *file, struct socket *sock, int skb_copy_datagram_iovec(const struct sk_buff *from, int offset, struct iovec *to, int size); int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, int hlen, - struct iovec *iov, int len); + struct iovec *iov); int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset, const struct iovec *from, int from_offset, int len); diff --git a/net/core/datagram.c b/net/core/datagram.c index 169f742d1464..3c69a464595e 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -818,7 +818,6 @@ EXPORT_SYMBOL(__skb_checksum_complete); * @skb: skbuff * @hlen: hardware length * @iov: io vector - * @len: amount of data to copy from skb to iov * * Caller _must_ check that skb will fit to this iovec. * @@ -828,14 +827,11 @@ EXPORT_SYMBOL(__skb_checksum_complete); * can be modified! */ int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, - int hlen, struct iovec *iov, int len) + int hlen, struct iovec *iov) { __wsum csum; int chunk = skb->len - hlen; - if (chunk > len) - chunk = len; - if (!chunk) return 0; diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 43404d3f9da8..036615125532 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -4903,7 +4903,7 @@ static int tcp_copy_to_iovec(struct sock *sk, struct sk_buff *skb, int hlen) err = skb_copy_datagram_iovec(skb, hlen, tp->ucopy.iov, chunk); else err = skb_copy_and_csum_datagram_iovec(skb, hlen, - tp->ucopy.iov, chunk); + tp->ucopy.iov); if (!err) { tp->ucopy.len -= chunk; diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 4b9e4aba11b0..10c1530ba978 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1307,7 +1307,7 @@ try_again: else { err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), - msg->msg_iov, copied); + msg->msg_iov); if (err == -EINVAL) goto csum_copy_err; diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index a652fdb6bd5d..1463757e8682 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -492,7 +492,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, goto csum_copy_err; err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); } else { - err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov, copied); + err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); if (err == -EINVAL) goto csum_copy_err; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index eb38829d8919..f94b850511e3 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -428,8 +428,7 @@ try_again: err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, copied); else { - err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), - msg->msg_iov, copied); + err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); if (err == -EINVAL) goto csum_copy_err; }
