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[IPV6]: Check length of optval provided by user in setsockopt(). 

Check length of setsockopt's optval, which provided by user, before copy it
from user space.
For POSIX compliant, return -EINVAL for setsockopt of short lengths.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
Wang Chen 2008-04-07 09:42:07 +08:00 committed by YOSHIFUJI Hideaki
parent 7f1eced8b0
commit a28398ba61
1 changed files with 8 additions and 2 deletions
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10
net/ipv6/ipv6_sockglue.c
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@ -449,6 +449,9 @@ done:
{
struct ipv6_mreq mreq;
if (optlen < sizeof(struct ipv6_mreq))
goto e_inval;
retv = -EPROTO;
if (inet_sk(sk)->is_icsk)
break;
@ -468,7 +471,7 @@ done:
{
struct ipv6_mreq mreq;
if (optlen != sizeof(struct ipv6_mreq))
if (optlen < sizeof(struct ipv6_mreq))
goto e_inval;
retv = -EFAULT;
@ -487,6 +490,9 @@ done:
struct group_req greq;
struct sockaddr_in6 *psin6;
if (optlen < sizeof(struct group_req))
goto e_inval;
retv = -EFAULT;
if (copy_from_user(&greq, optval, sizeof(struct group_req)))
break;
@ -511,7 +517,7 @@ done:
struct group_source_req greqs;
int omode, add;
if (optlen != sizeof(struct group_source_req))
if (optlen < sizeof(struct group_source_req))
goto e_inval;
if (copy_from_user(&greqs, optval, sizeof(greqs))) {
retv = -EFAULT;