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net: remove duplicate fetch in sock_getsockopt

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In sock_getsockopt(), 'optlen' is fetched the first time from userspace.
'len < 0' is then checked. Then in condition 'SO_MEMINFO', 'optlen' is
fetched the second time from userspace.

If change it between two fetches may cause security problems or unexpected
behaivor, and there is no reason to fetch it a second time.

To fix this, we need to remove the second fetch.

Signed-off-by: JingYi Hou <houjingyi647@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
JingYi Hou 2019-06-17 14:56:05 +08:00 committed by David S. Miller
parent d0f84d0856
commit d0bae4a0e3
1 changed files with 0 additions and 3 deletions
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3
net/core/sock.c
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@ -1477,9 +1477,6 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
{
u32 meminfo[SK_MEMINFO_VARS];
if (get_user(len, optlen))
return -EFAULT;
sk_get_meminfo(sk, meminfo);
len = min_t(unsigned int, len, sizeof(meminfo));