linux-kernel - [PATCH 1/2] xfs: ensure tmp_logflags is initialized in xfs_bmap_del_extent

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Message-Id: <20231128053202.29007-2-zhangjiachen.jaycee@bytedance.com>
Date:   Tue, 28 Nov 2023 13:32:01 +0800
From:   Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
To:     Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>
Cc:     Dave Chinner <dchinner@...hat.com>,
        Allison Henderson <allison.henderson@...cle.com>,
        Zhang Tianci <zhangtianci.1997@...edance.com>,
        Brian Foster <bfoster@...hat.com>, Ben Myers <bpm@....com>,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        xieyongji@...edance.com, me@...x.top,
        Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
Subject: [PATCH 1/2] xfs: ensure tmp_logflags is initialized in xfs_bmap_del_extent_real

In the case of returning -ENOSPC, ensure tmp_logflags is initialized by 0.
Otherwise the caller __xfs_bunmapi will set uninitialized illegal
tmp_logflags value into xfs log, which might cause unpredictable error
in the log recovery procedure.

Fixes: 1b24b633aafe ("xfs: move some more code into xfs_bmap_del_extent_real")
Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
---
 fs/xfs/libxfs/xfs_bmap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index be62acffad6c..7cb395a38507 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -5048,8 +5048,10 @@ xfs_bmap_del_extent_real(
 	if (tp->t_blk_res == 0 &&
 	    ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
 	    ifp->if_nextents >= XFS_IFORK_MAXEXT(ip, whichfork) &&
-	    del->br_startoff > got.br_startoff && del_endoff < got_endoff)
-		return -ENOSPC;
+	    del->br_startoff > got.br_startoff && del_endoff < got_endoff) {
+		error = -ENOSPC;
+		goto done;
+	}
 
 	flags = XFS_ILOG_CORE;
 	if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
-- 
2.20.1