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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-11-21 03:14:34 +0100
committerDavid S. Miller <davem@davemloft.net>2013-11-20 21:52:30 -0500
commit68c6beb373955da0886d8f4f5995b3922ceda4be (patch)
tree9e5d243a17858f1b21cb4f011d472a7a57187866 /net
parentf3d3342602f8bcbf37d7c46641cb9bca7618eb1c (diff)
net: add BUG_ON if kernel advertises msg_namelen > sizeof(struct sockaddr_storage)
In that case it is probable that kernel code overwrote part of the stack. So we should bail out loudly here. The BUG_ON may be removed in future if we are sure all protocols are conformant. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/socket.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/socket.c b/net/socket.c
index fc285564e49e..0b18693f2be6 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -221,12 +221,13 @@ static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
int err;
int len;
+ BUG_ON(klen > sizeof(struct sockaddr_storage));
err = get_user(len, ulen);
if (err)
return err;
if (len > klen)
len = klen;
- if (len < 0 || len > sizeof(struct sockaddr_storage))
+ if (len < 0)
return -EINVAL;
if (len) {
if (audit_sockaddr(klen, kaddr))

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