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

[Sven Peter]

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?


[1] https://lore.kernel.org/asahi/20250202-rtkit-crashdump-v1-1-9d38615b4e12@asahilina.net/


Best,


Sven