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ipv4: check optlen for IP_MULTICAST_IF option
[linux-block.git]
/
net
/
ipv4
/
ip_sockglue.c
diff --git
a/net/ipv4/ip_sockglue.c
b/net/ipv4/ip_sockglue.c
index fc7993e9061fd855d1cb34b42fa491c49dcd669d..5a0693576e821c628edfb3f436243a0f8b107d4a 100644
(file)
--- a/
net/ipv4/ip_sockglue.c
+++ b/
net/ipv4/ip_sockglue.c
@@
-611,6
+611,9
@@
static int do_ip_setsockopt(struct sock *sk, int level,
* Check the arguments are allowable
*/
+ if (optlen < sizeof(struct in_addr))
+ goto e_inval;
+
err = -EFAULT;
if (optlen >= sizeof(struct ip_mreqn)) {
if (copy_from_user(&mreq, optval, sizeof(mreq)))