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ipv4: check optlen for IP_MULTICAST_IF option

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Due to man page of setsockopt, if optlen is not valid, kernel should return
-EINVAL. But a simple testcase as following, errno is 0, which means setsockopt
is successful.
	addr.s_addr = inet_addr("192.1.2.3");
	setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &addr, 1);
	printf("errno is %d\n", errno);

Xiaotian Feng([email protected]) caught the bug. We fix it firstly checking
the availability of optlen and then dealing with the logic like other options.

Reported-by: Xiaotian Feng <[email protected]>
Signed-off-by: Shan Wei <[email protected]>
Acked-by: Alexey Kuznetsov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Shan Wei 2009-09-22 15:41:10 +00:00 • committed by David S. Miller
commit 0915921bde
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/ip_sockglue.c
View file

@ -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)))