linux-kernel - [PATCH 5.15 056/148] xfs: fix xfs_ifree() error handling to not leak perag ref

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Date:   Mon, 26 Sep 2022 12:11:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Brian Foster <bfoster@...hat.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Dave Chinner <dchinner@...hat.com>,
        Dave Chinner <david@...morbit.com>,
        Leah Rumancik <leah.rumancik@...il.com>
Subject: [PATCH 5.15 056/148] xfs: fix xfs_ifree() error handling to not leak perag ref

From: Brian Foster <bfoster@...hat.com>

[ Upstream commit 6f5097e3367a7c0751e165e4c15bc30511a4ba38 ]

For some reason commit 9a5280b312e2e ("xfs: reorder iunlink remove
operation in xfs_ifree") replaced a jump to the exit path in the
event of an xfs_difree() error with a direct return, which skips
releasing the perag reference acquired at the top of the function.
Restore the original code to drop the reference on error.

Fixes: 9a5280b312e2e ("xfs: reorder iunlink remove operation in xfs_ifree")
Signed-off-by: Brian Foster <bfoster@...hat.com>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Signed-off-by: Dave Chinner <david@...morbit.com>
Signed-off-by: Leah Rumancik <leah.rumancik@...il.com>
Acked-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/xfs/xfs_inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2634,7 +2634,7 @@ xfs_ifree(
 	 */
 	error = xfs_difree(tp, pag, ip->i_ino, &xic);
 	if (error)
-		return error;
+		goto out;
 
 	error = xfs_iunlink_remove(tp, pag, ip);
 	if (error)