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net/smc: add error handling for get_user() 

For security reasons the return code of get_user() should always be
checked.

Fixes: 01d2f7e2cd ("net/smc: sockopts TCP_NODELAY and TCP_CORK")
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2018-07-18 15:22:50 +02:00 committed by David S. Miller
parent 99be51f11d
commit ac0107edba
1 changed files with 2 additions and 1 deletions
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3
net/smc/af_smc.c
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@ -1456,7 +1456,8 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
if (optlen < sizeof(int))
return -EINVAL;
get_user(val, (int __user *)optval);
if (get_user(val, (int __user *)optval))
return -EFAULT;
lock_sock(sk);
switch (optname) {