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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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)
*/
--
-
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