From: JingYi Hou <houjingyi647@gmail.com>
Date: Mon, 17 Jun 2019 14:56:05 +0800
Subject: net: remove duplicate fetch in sock_getsockopt
Git-commit: d0bae4a0e3d8c5690a885204d7eb2341a5b4884d
Patch-mainline: 5.2-rc6
References: networking-stable-19_07_02
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
net/core/sock.c | 3 ---
1 file changed, 3 deletions(-)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1320,9 +1320,6 @@ int sock_getsockopt(struct socket *sock,
{
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));