From 58fcb8df0bf663bb6b8f46cd3010bfe8d13d97cf Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Wed, 10 Aug 2005 18:15:12 -0400
Subject: [PATCH] [PATCH] NFS: Ensure ACL xdr code doesn't overflow.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
fs/nfs_common/nfsacl.c | 1 +
include/linux/sunrpc/xdr.h | 1 +
net/sunrpc/xdr.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/fs/nfs_common/nfsacl.c b/fs/nfs_common/nfsacl.c
index 18c58c32e326..251e5a1bb1c4 100644
--- a/fs/nfs_common/nfsacl.c
+++ b/fs/nfs_common/nfsacl.c
@@ -239,6 +239,7 @@ nfsacl_decode(struct xdr_buf *buf, unsigned int base, unsigned int *aclcnt,
if (xdr_decode_word(buf, base, &entries) ||
entries > NFS_ACL_MAX_ENTRIES)
return -EINVAL;
+ nfsacl_desc.desc.array_maxlen = entries;
err = xdr_decode_array2(buf, base + 4, &nfsacl_desc.desc);
if (err)
return err;
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 34ec3e8d99b3..23448d0fb5bc 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -177,6 +177,7 @@ typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
struct xdr_array2_desc {
unsigned int elem_size;
unsigned int array_len;
+ unsigned int array_maxlen;
xdr_xcode_elem_t xcode;
};
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 8a4d9c106af1..fde16f40a581 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -993,6 +993,7 @@ xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
return -EINVAL;
} else {
if (xdr_decode_word(buf, base, &desc->array_len) != 0 ||
+ desc->array_len > desc->array_maxlen ||
(unsigned long) base + 4 + desc->array_len *
desc->elem_size > buf->len)
return -EINVAL;
--
2.30.9