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
......@@ -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;
}
......
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