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

…recvfrom Cc: [email protected] # v3.19 Signed-off-by: Al Viro <[email protected]> Signed-off-by: David S. Miller <[email protected]>
kyagi · Mar 20, 2015 · 4de930e · 4de930e
1 parent 91edd09
commit 4de930e
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/net/socket.c b/net/socket.c
@@ -1702,6 +1702,8 @@ SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
 
 	if (len > INT_MAX)
 		len = INT_MAX;
+	if (unlikely(!access_ok(VERIFY_READ, buff, len)))
+		return -EFAULT;
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (!sock)
 		goto out;
@@ -1760,6 +1762,8 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
 
 	if (size > INT_MAX)
 		size = INT_MAX;
+	if (unlikely(!access_ok(VERIFY_WRITE, ubuf, size)))
+		return -EFAULT;
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (!sock)
 		goto out;