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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-31 14:23:49 +01:00
Zhao Li
0451392295
nl80211_pmsr_start() assigns the request cookie, calls the driver's
->start_pmsr() callback, and only then adds the request to
wdev->pmsr_list, without holding pmsr_lock for the addition.
mac80211_hwsim saves the request in its start callback and returns. Since
nl80211 uses parallel_ops, an immediate REPORT_PMSR can then run before
nl80211_pmsr_start() reaches its post-start list_add_tail(). hwsim also
dispatches reports from its virtio receive workqueue. Completion removes
the request from wdev->pmsr_list under pmsr_lock and frees it.
Thus completion can precede publication, race the unlocked list mutation,
or free the request before nl80211_pmsr_start() reads req->cookie for the
netlink reply.
Add the request to wdev->pmsr_list under pmsr_lock before calling the
driver, and use a cookie value saved before the call so the request is not
dereferenced after a successful start. On an error return the driver has
not retained or completed the request, so remove it from the list under the
lock and free it.
Fixes: 9bb7e0f24e ("cfg80211: add peer measurement with FTM initiator API")
Link: https://lore.kernel.org/all/[email protected]/
Assisted-by: Codex:gpt-5
Assisted-by: Claude:opus-4.8
Signed-off-by: Zhao Li <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Johannes Berg <[email protected]>