Re: [PATCH] firmware_loader: Fix use-after-free Read in firmware_loading_store

[Luis Chamberlain]

On Fri, Jul 09, 2021 at 10:38:12AM -0600, Shuah Khan wrote:
> However I am seeing the following over and over again in the
> log - hence I think it is safer to check the aborted status
> in __fw_load_abort().
> 
> ? __list_del_entry_valid+0xe0/0xf0
> [  348.604808][T12994]  __list_del_entry_valid+0xe0/0xf0
> [  348.610020][T12994]  firmware_loading_store+0x141/0x650
> [  348.615761][T12994]  ? firmware_data_write+0x4e0/0x4e0
> [  348.621064][T12994]  ? sysfs_file_ops+0x1c0/0x1c0
> [  348.625921][T12994]  dev_attr_store+0x50/0x80
> 
> Also the fallback logic takes actions based on errors as in
> fw_load_sysfs_fallback() that returns -EAGAIN which would
> trigger request_firmware() again.
> 
> Based on all of this I think this fix is needed, if only I can
> test for sure.

Shuah, curious if you had read this patch from Anirudh Rayabharam
and my response to that v4 patch iteration?

https://lkml.kernel.org/r/20210518155921.4181-1-mail@xxxxxxxxxxxxx

  Luis