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| author | JingYi Hou <houjingyi647@gmail.com> | 2019-06-17 09:56:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-03 14:14:47 +0300 |
| commit | 7d76fc211609063cc22cb1cef2e3297630a31199 (patch) | |
| tree | f310f4d3f976f30de455a6deac2dfe0ba422d1f6 /net | |
| parent | 05dceb60e5dd7a40fd9b6c565a62ce272ed4e6a2 (diff) | |
| download | linux-7d76fc211609063cc22cb1cef2e3297630a31199.tar.xz | |
net: remove duplicate fetch in sock_getsockopt
[ 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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index c9668dcb5eb9..9c32e8eb64da 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1348,9 +1348,6 @@ 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)); |