net: validate the range we feed to iov_iter_init() in sys_sendto/sys_recvfrom

Al Viro committed 11 years ago

Commit 4de930e1 parent 91edd091 file · +4 −0Browse files

Unified · Split

net/socket.c+4−0

@@ -1702,6 +1702,8 @@ SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, · 1701 unmodified lines
1702	1702
1703	1703	if (len > INT_MAX)
1704	1704	len = INT_MAX;
	1705	+ if (unlikely(!access_ok(VERIFY_READ, buff, len)))
	1706	+ return -EFAULT;
1705	1707	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1706	1708	if (!sock)
1707	1709	goto out;
@@ -1760,6 +1762,8 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, · 52 unmodified lines
1760	1762
1761	1763	if (size > INT_MAX)
1762	1764	size = INT_MAX;
	1765	+ if (unlikely(!access_ok(VERIFY_WRITE, ubuf, size)))
	1766	+ return -EFAULT;
1763	1767	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1764	1768	if (!sock)
1765	1769	goto out;