From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 15 Mar 2022 18:34:06 +0300
Subject: [PATCH] NFSD: prevent integer overflow on 32 bit systems
Git-commit: 23a9dbbe0faf124fc4c139615633b9d12a3a89ef
Patch-mainline: v5.18
References: git-fixes

On a 32 bit system, the "len * sizeof(*p)" operation can have an
integer overflow.

Cc: stable@vger.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 include/linux/sunrpc/xdr.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -730,6 +730,8 @@ xdr_stream_decode_uint32_array(struct xd
 
 	if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
 		return -EBADMSG;
+	if (len > SIZE_MAX / sizeof(*p))
+		return -EBADMSG;
 	p = xdr_inline_decode(xdr, len * sizeof(*p));
 	if (unlikely(!p))
 		return -EBADMSG;