| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.1 34/55] net: remove duplicate fetch in sock_getsockopt | Date | Tue, 2 Jul 2019 10:01:42 +0200 |
| |
From: JingYi Hou <houjingyi647@gmail.com>
[ Upstream commit d0bae4a0e3d8c5690a885204d7eb2341a5b4884d ]
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/core/sock.c | 3 --- 1 file changed, 3 deletions(-)
--- a/net/core/sock.c +++ b/net/core/sock.c @@ -1482,9 +1482,6 @@ 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));
|