Re: [REGRESSION] ext4: oops in ext4_finish_bio() after enabling encryption on a mounted fs

[sashiko-bot@kernel.org]

> Hi,
> 
> I'd like to report a bug in the ext4 code. I confirm that it happens
> with the latest stable kernel (7.2.7), but mainline (7.3-rc4) does not
> seem to be affected.
> 
> The problem is very easy to reproduce:
> 
> 1) Enable encryption on an ext4 filesystem with tune2fs -O encrypt
> 2) Create an empty directory and encrypt it (fscrypt encrypt /foo or whatever).
> 3) Write some data to it (head -c head -c 10M /dev/urandom > /foo/file.bin)
> 4) sync
> 
> [   42.962615] BUG: kernel NULL pointer dereference, address: 0000000000000028
> [   42.965440] #PF: supervisor read access in kernel mode
> [ ... ]
>  	mapping_set_folio_order_range(inode->i_mapping, min_order, max_order);
> 
> Regards,
> 
> Berto

Sashiko has reviewed this patch and found no issues. It looks great!

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