wifi: mac80211: don't allow injecting frames wider than the chanctx

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Frames injected on a monitor interface can carry a radiotap
field requesting a bandwidth, which mac80211 passes down to
the driver regardless of the the actual operational bandwidth.

If the bandwidth requested is too wide, that triggers a warning
in hwsim:

  WARN_ON(hwsim_get_chanwidth(bw) > hwsim_get_chanwidth(confbw))

Drop such frames entirely instead since they cannot be sent.

Assisted-by: LLM
Fixes: 646e76bb5d ("mac80211: parse VHT info in injected frames")
Reported-by: syzbot+435fdb053cf98bfa5778@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=435fdb053cf98bfa5778
Link: https://patch.msgid.link/20260908122838.201719-13-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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This commit is contained in:

Johannes Berg 2026-09-08 14:28:12 +02:00

parent c1ba7f7f18

commit e14bf37bb2

3 changed files with 31 additions and 4 deletions

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5

include/net/mac80211.h

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2

net/mac80211/iface.c

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28

net/mac80211/tx.c

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