Re: [PATCH] mac80211_hwsim: fix divide error in mac80211_hwsim_link_info_changed

[Johannes Berg]

On Fri, 2025-12-05 at 21:05 +0530, Deepakkumar Karn wrote:
> Prevent a division by zero crash when userspace provides a zero beacon
> interval value. The crash occurs in the beacon timer setup code path when
> info->beacon_int is 0, causing bcn_int to be 0 and triggering a divide
> error in the do_div() macro.The issue can be triggered from userspace via
> nl80211/cfg80211 when configuring a virtual interface in AP mode with an
> invalid beacon interval.

Seems like we should not let userspace do that, to protect all other
drivers too, not just hwsim.

johannes