Re: [PATCH AUTOSEL 4.19 16/25] wifi: ath10k: reset pointer after memory free to avoid potential use-after-free

[Greg KH]

On Tue, Oct 18, 2022 at 11:53:56AM +0200, Pavel Machek wrote:
> Hi!
> 
> > From: Wen Gong <quic_wgong@xxxxxxxxxxx>
> > 
> > [ Upstream commit 1e1cb8e0b73e6f39a9d4a7a15d940b1265387eb5 ]
> > 
> > When running suspend test, kernel crash happened in ath10k, and it is
> > fixed by commit b72a4aff947b ("ath10k: skip ath10k_halt during suspend
> > for driver state RESTARTING").
> > 
> > Currently the crash is fixed, but as a common code style, it is better
> > to set the pointer to NULL after memory is free.
> > 
> > This is to address the code style and it will avoid potential bug of
> > use-after-free.
> 
> We don't have this patch in 4.19:
> 
> b72a4aff947b ("ath10k: skip ath10k_halt during suspend for driver state RESTARTING").
> 
> We probably should take that one, as this may depend on it. On the
> other hand, we don't need this one as it is just a cleanup...

I've dropped this from all queues now, thanks.

greg k-h