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| author | Sabrina Dubroca <sd@queasysnail.net> | 2015-10-15 12:25:00 -0500 |
|---|---|---|
| committer | Simon Shields <keepcalm444@gmail.com> | 2016-03-15 18:27:51 +1100 |
| commit | 60d05551c60819bea1c8cfe1e5427a47a21bccd1 (patch) | |
| tree | 103d6d3c90bb0857da153860af8739b3a3ef896a /net/core | |
| parent | 14f55d438ceb4fb380151f601a78a937e1bb7e5e (diff) | |
| download | kernel_samsung_smdk4412-60d05551c60819bea1c8cfe1e5427a47a21bccd1.zip kernel_samsung_smdk4412-60d05551c60819bea1c8cfe1e5427a47a21bccd1.tar.gz kernel_samsung_smdk4412-60d05551c60819bea1c8cfe1e5427a47a21bccd1.tar.bz2 | |
net: add length argument to skb_copy_and_csum_datagram_iovec
Without this length argument, we can read past the end of the iovec in
memcpy_toiovec because we have no way of knowing the total length of the
iovec's buffers.
This is needed for stable kernels where 89c22d8c3b27 ("net: Fix skb
csum races when peeking") has been backported but that don't have the
ioviter conversion, which is almost all the stable trees <= 3.18.
This also fixes a kernel crash for NFS servers when the client uses
-onfsvers=3,proto=udp to mount the export.
Change-Id: I1865e3d7a1faee42a5008a9ad58c4d3323ea4bab
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
(cherry picked from commit c91234366e4cfd4f70c73e7d79ede92a6e462a88)
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/datagram.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index 18ac112..aaf4559 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -672,6 +672,7 @@ 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. * @@ -681,11 +682,14 @@ 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 hlen, struct iovec *iov, int len) { __wsum csum; int chunk = skb->len - hlen; + if (chunk > len) + chunk = len; + if (!chunk) return 0; |