Unverified Commit 031d6f60 authored by Konstantin Komarov's avatar Konstantin Komarov
Browse files

fs/ntfs3: Additional check in ntfs_file_release 



Reported-by: default avatar <syzbot+8c652f14a0fde76ff11d@syzkaller.appspotmail.com>
Signed-off-by: default avatarKonstantin Komarov <almaz.alexandrovich@paragon-software.com>
parent a33fb016

fs/ntfs3/file.c

+8 −1
Original line number Diff line number Diff line
@@ -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);