Re: Regression Bug: use-after-free Write in udf_close_lvid

[Kun Hu]

> 
> The syzlang reproducer seems to be missing (the link points to C code). As
> a result one has to decipher what's actually happening from the C code
> which is a bit tedious... Please fix that.

Sorry for incorrect link, 

Syzlang Reproducer: https://drive.google.com/file/d/1vshdFSRaGY3N4wyFscZdjKZsMU5j0z6H/view?usp=sharing

> 
>> Similar Bug: https://lkml.org/lkml/2022/5/24/336
> 
> I have checked your reproducer and as far as I can tell it will modify
> block device under a mounted filesystem (trying to use the same loop device
> for xfs and udf). Such action is effectively equivalent to corrupting
> memory. Please make sure CONFIG_BLK_DEV_WRITE_MOUNTED is disabled in all
> your kernel configs used for fuzzing to avoid these invalid reproducers.
> Thanks!
> 

OK. I'll retest and get back to you on the results of those issues you mentioned

—
thanks，
Kun Hu