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fs/ntfs3: fix deadlock in mark_as_free_ex

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commit bfbe5b31ca upstream.

Reported-by: syzbot+e94d98936a0ed08bde43@syzkaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Konstantin Komarov 2023-06-30 16:22:53 +04:00 committed by Greg Kroah-Hartman
parent ab40c7ab7a
commit efe43d1bcb
1 changed files with 5 additions and 1 deletions
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6
fs/ntfs3/fsntfs.c
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@ -2458,10 +2458,12 @@ 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;
@ -2493,6 +2495,8 @@ 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);
}
/*