[PATCH 3.19 022/123] net: validate the range we feed to iov_iter_init() in sys_sendto/sys_recvfrom

[Greg Kroah-Hartman]

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

commit 4de930efc23b92ddf88ce91c405ee645fe6e27ea upstream.

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/socket.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/socket.c
+++ b/net/socket.c
@@ -1765,6 +1765,8 @@ SYSCALL_DEFINE6(sendto, int, fd, void __
 
 	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;
@@ -1823,6 +1825,8 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void
 
 	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;


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