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| author | JingYi Hou <houjingyi647@gmail.com> | 2019-06-17 14:56:05 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-18 10:04:16 -0700 |
| commit | d0bae4a0e3d8c5690a885204d7eb2341a5b4884d (patch) | |
| tree | ab344ba88e15da3f4a985f9ee4e662b0563fbfc3 | |
| parent | d0f84d0856c11fbafadae3d580f6a9c98d818ccd (diff) | |
| download | linux-d0bae4a0e3d8c5690a885204d7eb2341a5b4884d.tar.bz2 | |
net: remove duplicate fetch in sock_getsockopt
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>
| -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 af09a23e4822..aa4a00d381e3 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -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)); |