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do_ipv6_setsockopt(): don't open-code memdup_user() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-05-13 18:22:53 -04:00
parent aa47cc1c3c
commit 43727da90e
1 changed files with 3 additions and 8 deletions
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11
net/ipv6/ipv6_sockglue.c
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@ -735,14 +735,9 @@ done:
retv = -ENOBUFS;
break;
}
gsf = kmalloc(optlen, GFP_KERNEL);
if (!gsf) {
retv = -ENOBUFS;
break;
}
retv = -EFAULT;
if (copy_from_user(gsf, optval, optlen)) {
kfree(gsf);
gsf = memdup_user(optval, optlen);
if (IS_ERR(gsf)) {
retv = PTR_ERR(gsf);
break;
}
/* numsrc >= (4G-140)/128 overflow in 32 bits */