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| author |   Herbert Xu <herbert@gondor.apana.org.au> | 2007-09-06 14:06:35 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@kimchee.(none)> | 2007-09-11 10:29:07 +0200 |
| commit | ef8aef55ce61fd0e2af798695f7386ac756ae1e7 (patch) | |
| tree | dd3d30a25e69fa94dcffa024e5a87758c0f6ba24 /net/core | |
| parent | [TG3]: Workaround MSI bug on 5714/5780. (diff) | |
| download | linux-dev-ef8aef55ce61fd0e2af798695f7386ac756ae1e7.tar.xz linux-dev-ef8aef55ce61fd0e2af798695f7386ac756ae1e7.zip | |
[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 <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/datagram.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index cb056f476126..029b93e246b4 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -450,6 +450,9 @@ int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, __wsum csum; int chunk = skb->len - hlen; + if (!chunk) + return 0; + /* Skip filled elements. * Pretty silly, look at memcpy_toiovec, though 8) */ |