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fs/ntfs3: Additional check in ntfs_file_release

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Reported-by: syzbot+8c652f14a0fde76ff11d@syzkaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2024-09-04 12:57:31 +03:00
parent a33fb016e4
commit 031d6f6082
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GPG Key ID: A9B0331F832407B6
1 changed files with 8 additions and 1 deletions
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9
fs/ntfs3/file.c
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@ -1314,7 +1314,14 @@ static int ntfs_file_release(struct inode *inode, struct file *file)
/* 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)) {
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);