From 4de930efc23b92ddf88ce91c405ee645fe6e27ea Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 20 Mar 2015 17:41:43 +0000 Subject: [PATCH] net: validate the range we feed to iov_iter_init() in sys_sendto/sys_recvfrom Cc: stable@vger.kernel.org # v3.19 Signed-off-by: Al Viro Signed-off-by: David S. Miller --- net/socket.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/socket.c b/net/socket.c index bbedbfcb42c2..245330ca0015 100644 --- 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; -- 2.20.1