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Commit cbc8cc33 authored by Jan Kara's avatar Jan Kara
Browse files

udf: Fix possible corruption when close races with write 



When we close a file, we remove preallocated blocks from it. But this
truncation was not protected by i_mutex and thus it could have raced with a
write through a different fd and cause crashes or even filesystem corruption.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 81056dd0

fs/udf/file.c

+2 −0
Original line number Diff line number Diff line
@@ -193,9 +193,11 @@ int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, 
static int udf_release_file(struct inode *inode, struct file *filp)

{

	if (filp->f_mode & FMODE_WRITE) {

		mutex_lock(&inode->i_mutex);

		lock_kernel();

		udf_discard_prealloc(inode);

		unlock_kernel();

		mutex_unlock(&inode->i_mutex);

	}

	return 0;

}