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ip*_mc_gsfget(): lift copyout of struct group_filter into callers

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pass the userland pointer to the array in its tail, so that part
gets copied out by our functions; copyout of everything else is
done in the callers.  Rationale: reuse for compat; the array
is the same in native and compat, the layout of parts before it
is different for compat.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2020-03-29 17:18:30 -04:00
parent e9c375fb5e
commit 931ca7ab7f
6 changed files with 38 additions and 31 deletions
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18
net/ipv6/ipv6_sockglue.c
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@@ -1056,18 +1056,28 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
break;
case MCAST_MSFILTER:
{
struct group_filter __user *p = (void __user *)optval;
struct group_filter gsf;
const int size0 = offsetof(struct group_filter, gf_slist);
int num;
int err;
if (len < GROUP_FILTER_SIZE(0))
if (len < size0)
return -EINVAL;
if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
if (copy_from_user(&gsf, p, size0))
return -EFAULT;
if (gsf.gf_group.ss_family != AF_INET6)
return -EADDRNOTAVAIL;
num = gsf.gf_numsrc;
lock_sock(sk);
err = ip6_mc_msfget(sk, &gsf,
(struct group_filter __user *)optval, optlen);
err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
if (!err) {
if (num > gsf.gf_numsrc)
num = gsf.gf_numsrc;
if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
copy_to_user(p, &gsf, size0))
err = -EFAULT;
}
release_sock(sk);
return err;
}