linux-kernel - [PATCH 5.10 05/86] xfs: prevent a WARN_ONCE() in xfs_ioc_attr

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Message-Id: <20220829105756.743714196@linuxfoundation.org>
Date:   Mon, 29 Aug 2022 12:58:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Amir Goldstein <amir73il@...il.com>
Subject: [PATCH 5.10 05/86] xfs: prevent a WARN_ONCE() in xfs_ioc_attr_list()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 6ed6356b07714e0198be3bc3ecccc8b40a212de4 upstream.

The "bufsize" comes from the root user.  If "bufsize" is negative then,
because of type promotion, neither of the validation checks at the start
of the function are able to catch it:

	if (bufsize < sizeof(struct xfs_attrlist) ||
	    bufsize > XFS_XATTR_LIST_MAX)
		return -EINVAL;

This means "bufsize" will trigger (WARN_ON_ONCE(size > INT_MAX)) in
kvmalloc_node().  Fix this by changing the type from int to size_t.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Amir Goldstein <amir73il@...il.com>
Acked-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/xfs/xfs_ioctl.c |    2 +-
 fs/xfs/xfs_ioctl.h |    5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -371,7 +371,7 @@ int
 xfs_ioc_attr_list(
 	struct xfs_inode		*dp,
 	void __user			*ubuf,
-	int				bufsize,
+	size_t				bufsize,
 	int				flags,
 	struct xfs_attrlist_cursor __user *ucursor)
 {
--- a/fs/xfs/xfs_ioctl.h
+++ b/fs/xfs/xfs_ioctl.h
@@ -38,8 +38,9 @@ xfs_readlink_by_handle(
 int xfs_ioc_attrmulti_one(struct file *parfilp, struct inode *inode,
 		uint32_t opcode, void __user *uname, void __user *value,
 		uint32_t *len, uint32_t flags);
-int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf, int bufsize,
-	int flags, struct xfs_attrlist_cursor __user *ucursor);
+int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf,
+		      size_t bufsize, int flags,
+		      struct xfs_attrlist_cursor __user *ucursor);
 
 extern struct dentry *
 xfs_handle_to_dentry(