[PATCH] wifi: mt76: mt7921: fix null pointer access in mt792x_mac_link_bss_remove

[Linux regression tracking (Thorsten Leemhuis)]

On 19.07.24 01:46, sean.wang at kernel.org wrote:
> From: Sean Wang <sean.wang at mediatek.com>
> 
> Fix null pointer access in mt792x_mac_link_bss_remove.
> 
> To prevent null pointer access, we should assign the vif to bss_conf in
> mt7921_add_interface. This ensures that subsequent operations on the BSS
> can properly reference the correct vif.
>
> [...]
>> Fixes: 1541d63c5fe2 ("wifi: mt76: mt7925: add
mt7925_mac_link_bss_remove to remove per-link BSS")
> Reported-by: Bert Karwatzki <spasswolf at web.de>
> Closes: https://lore.kernel.org/linux-wireless/2fee61f8c903d02a900ca3188c3742c7effd102e.camel@web.de/#b
> Signed-off-by: Sean Wang <sean.wang at mediatek.com>

TWIMC, Mike (now CCed) ran into the problem and on bugzilla confirmed
that this fixes the problem:

https://bugzilla.kernel.org/show_bug.cgi?id=219084
https://lore.kernel.org/all/CAHbf0-HOS-jdRGvJOBmEgaaox3PDbDSTgnnZkZF9pz37Bmh2iw@mail.gmail.com/

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
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