Re: Use-after-free read in udf_add_fid_counter

[Jan Kara]

Hello!

On Tue 24-12-24 16:15:00, kun wrote:
> When using fuzzer tool to fuzz the latest Linux kernel, the following crash
> was triggered.
> 
> HEAD commit:  78d4f34e2115b517bcbfe7ec0d018bbbb6f9b0b8
> git tree: upstream
> Console output:
> https://drive.google.com/file/d/1ehAmTGzOEnJi1DBbX2g9TMMQjVHeJpIY/view?usp=sharing
> Kernel config: 
> https://drive.google.com/file/d/1RhT5dFTs6Vx1U71PbpenN7TPtnPoa3NI/view?usp=sharing
> C reproducer: 
> https://drive.google.com/file/d/1_1e3UBDrx_Q0vAIQtQg2RDT2FerBc6ar/view?usp=sharing
> Syzlang reproducer:
> https://drive.google.com/file/d/1WEhTD0nI5YfX9zcaa8mYMC_G7Nv_4iZv/view?usp=sharing
> Similar report: https://lkml.org/lkml/2023/5/8/1159

Similarly as in the case of another UDF report, please make sure
CONFIG_BLK_DEV_WRITE_MOUNTED is disabled in the kernel used for fuzzing.
Thanks!

								Honza
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR