linux-kernel - [PATCH 7/8] fs/ntfs3: fix deadlock in mark_as_free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 3 Jul 2023 11:27:52 +0400
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     <ntfs3@...ts.linux.dev>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 7/8] fs/ntfs3: fix deadlock in mark_as_free_ex


Reported-by: syzbot+e94d98936a0ed08bde43@...kaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
  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 edb51dc12f65..fbfe21dbb425 100644
--- a/fs/ntfs3/fsntfs.c
+++ b/fs/ntfs3/fsntfs.c
@@ -2454,10 +2454,12 @@ void mark_as_free_ex(struct ntfs_sb_info *sbi, 
CLST lcn, CLST len, bool trim)
  {
      CLST end, i, zone_len, zlen;
      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;
@@ -2511,6 +2513,8 @@ 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);
  }

  /*
-- 
2.34.1