linux-kernel - [PATCH AUTOSEL 5.15 05/28] fs/ntfs3: fix deadlock in mark_as_free

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Message-ID: <20231029225916.791798-5-sashal@kernel.org>
Date:   Sun, 29 Oct 2023 18:58:40 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        syzbot+e94d98936a0ed08bde43@...kaller.appspotmail.com,
        Sasha Levin <sashal@...nel.org>, ntfs3@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.15 05/28] fs/ntfs3: fix deadlock in mark_as_free_ex

From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>

[ Upstream commit bfbe5b31caa74ab97f1784fe9ade5f45e0d3de91 ]

Reported-by: syzbot+e94d98936a0ed08bde43@...kaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ntfs3/fsntfs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c
index e32a678861ffe..4413f6da68e60 100644
--- a/fs/ntfs3/fsntfs.c
+++ b/fs/ntfs3/fsntfs.c
@@ -2451,10 +2451,12 @@ void mark_as_free_ex(struct ntfs_sb_info *sbi, CLST lcn, CLST len, bool trim)
 {
 	CLST end, i;
 	struct wnd_bitmap *wnd = &sbi->used.bitmap;
+	bool dirty = false;
 
 	down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
 	if (!wnd_is_used(wnd, lcn, len)) {
-		ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
+		/* mark volume as dirty out of wnd->rw_lock */
+		dirty = true;
 
 		end = lcn + len;
 		len = 0;
@@ -2486,6 +2488,8 @@ void mark_as_free_ex(struct ntfs_sb_info *sbi, CLST lcn, CLST len, bool trim)
 
 out:
 	up_write(&wnd->rw_lock);
+	if (dirty)
+		ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
 }
 
 /*
-- 
2.42.0