linux-kernel - [PATCH] xfs: check for negatives in xfs_exchange_range

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Message-ID: <0e7def98-1479-4f3a-a69a-5f4d09e12fa8@moroto.mountain>
Date: Sat, 4 May 2024 14:27:36 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: Chandan Babu R <chandan.babu@...cle.com>, linux-xfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] xfs: check for negatives in xfs_exchange_range_checks()

The fxr->file1_offset and fxr->file2_offset variables come from the user
in xfs_ioc_exchange_range().  They are size loff_t which is an s64.
Check the they aren't negative.

Fixes: 9a64d9b3109d ("xfs: introduce new file range exchange ioctl")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
>From static analysis.  Untested.  Sorry!

 fs/xfs/xfs_exchrange.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/xfs/xfs_exchrange.c b/fs/xfs/xfs_exchrange.c
index c8a655c92c92..3465e152d928 100644
--- a/fs/xfs/xfs_exchrange.c
+++ b/fs/xfs/xfs_exchrange.c
@@ -337,6 +337,9 @@ xfs_exchange_range_checks(
 	if (IS_SWAPFILE(inode1) || IS_SWAPFILE(inode2))
 		return -ETXTBSY;
 
+	if (fxr->file1_offset < 0 || fxr->file2_offset < 0)
+		return -EINVAL;
+
 	size1 = i_size_read(inode1);
 	size2 = i_size_read(inode2);
 
-- 
2.43.0