5.15-stable review patch. If anyone has any objections, please let me know.
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From: Konstantin Komarov almaz.alexandrovich@paragon-software.com
commit 031d6f608290c847ba6378322d0986d08d1a645a upstream.
Reported-by: syzbot+8c652f14a0fde76ff11d@syzkaller.appspotmail.com Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Bin Lan bin.lan.cn@windriver.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Suraj Jitindar Singh surajjs@amazon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ntfs3/file.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
--- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -1192,8 +1192,16 @@ static int ntfs_file_release(struct inod int err = 0;
/* If we are last writer on the inode, drop the block reservation. */ - if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) && - atomic_read(&inode->i_writecount) == 1)) { + if (sbi->options->prealloc && + ((file->f_mode & FMODE_WRITE) && + atomic_read(&inode->i_writecount) == 1) + /* + * The only file when inode->i_fop = &ntfs_file_operations and + * init_rwsem(&ni->file.run_lock) is not called explicitly is MFT. + * + * Add additional check here. + */ + && inode->i_ino != MFT_REC_MFT) { ni_lock(ni); down_write(&ni->file.run_lock);