linux-kernel - [PATCH AUTOSEL 5.5 018/106] xfs: fix use-after-free when aborting corrupt attr inactivation

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Message-Id: <20200415114226.13103-18-sashal@kernel.org>
Date:   Wed, 15 Apr 2020 07:40:58 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Dave Chinner <dchinner@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, linux-xfs@...r.kernel.org
Subject: [PATCH AUTOSEL 5.5 018/106] xfs: fix use-after-free when aborting corrupt attr inactivation

From: "Darrick J. Wong" <darrick.wong@...cle.com>

[ Upstream commit 496b9bcd62b0b3a160be61e3265a086f97adcbd3 ]

Log the corrupt buffer before we release the buffer.

Fixes: a5155b870d687 ("xfs: always log corruption errors")
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/xfs/xfs_attr_inactive.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c
index 5ff49523d8ea1..c135bd5b2e61a 100644
--- a/fs/xfs/xfs_attr_inactive.c
+++ b/fs/xfs/xfs_attr_inactive.c
@@ -208,8 +208,8 @@ xfs_attr3_node_inactive(
 	 * Since this code is recursive (gasp!) we must protect ourselves.
 	 */
 	if (level > XFS_DA_NODE_MAXDEPTH) {
-		xfs_trans_brelse(*trans, bp);	/* no locks for later trans */
 		xfs_buf_corruption_error(bp);
+		xfs_trans_brelse(*trans, bp);	/* no locks for later trans */
 		return -EFSCORRUPTED;
 	}
 
-- 
2.20.1