commit 761b49f6b926104405f1c8f7d5ebd564c845e59d
author liucheng (G) <liucheng32@huawei.com> Thu Aug 29 13:47:40 2019 +0000
committer Joe Hershberger <joe.hershberger@ni.com> Wed Sep 04 11:37:19 2019 -0500
tree 6a96ab7b87f7bcc3414c624bd8ced071d60e2fcc
parent c580b29c95ab0ab8a8060db324f500a04d494b77

CVE: nfs: fix stack-based buffer overflow in some nfs_handler reply helper functions

This patch adds a check to nfs_handler to fix buffer overflow for CVE-2019-14197,
CVE-2019-14200, CVE-2019-14201, CVE-2019-14202, CVE-2019-14203 and CVE-2019-14204.

Signed-off-by: Cheng Liu <liucheng32@huawei.com>
Reported-by: Fermín Serna <fermin@semmle.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

net/nfs.c

diff --git a/net/nfs.c b/net/nfs.c
index d6a7f8e..b7cf3b3 100644
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -732,6 +732,9 @@
 
 	debug("%s\n", __func__);
 
+	if (len > sizeof(struct rpc_t))
+		return;
+
 	if (dest != nfs_our_port)
 		return;