commit ef8aef55ce61fd0e2af798695f7386ac756ae1e7 in mainline Subject: [2.6.20.21 review 34/35] [PATCH] [NET]: Do not dereference iov if length is zero When msg_iovlen is zero we shouldn't try to dereference msg_iov. Right now the only thing that tries to do so is skb_copy_and_csum_datagram_iovec. Since the total length should also be zero if msg_iovlen is zero, it's sufficient to check the total length there and simply return if it's zero. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/core/datagram.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) Index: 2.6/net/core/datagram.c =================================================================== --- 2.6.orig/net/core/datagram.c +++ 2.6/net/core/datagram.c @@ -444,6 +444,9 @@ int skb_copy_and_csum_datagram_iovec(str __wsum csum; int chunk = skb->len - hlen; + if (!chunk) + return 0; + /* Skip filled elements. * Pretty silly, look at memcpy_toiovec, though 8) */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/