[PATCH] soc: apple: rtkit: Fix use-after-free in apple_rtkit_crashlog_rx()

[Harshit Mogalapalli]

Hi,

On 18/02/25 21:04, Sven Peter wrote:
> Hi,
> 
> 
> On Wed, Feb 12, 2025, at 09:58, Harshit Mogalapalli wrote:
>> This code calls kfree(bfr); and then passes "bfr" to rtk->ops->crashed()
>> which is a use after free.  The ->crashed function pointer is implemented
>> by apple_nvme_rtkit_crashed() and it doesn't use the "bfr" pointer so
>> this doesn't cause a problem.  But it still looks sketchy as can be.
>>
>> Fix this by moving kfree() after the last usage of bfr.
>>
>> Fixes: c559645f343a ("soc: apple: rtkit: Pass the crashlog to the
>> crashed() callback")
> 
> This commit isn't upstream yet afaict, did you mean to post a review comment
> to [1] instead?
> 

I made the patch based on linux-next, linux-next has the patch merged.

Thanks,
Harshit
> 
> [1] https://lore.kernel.org/asahi/20250202-rtkit-crashdump-v1-1-9d38615b4e12@asahilina.net/
> 
> 
> Best,
> 
> 
> Sven