From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9044D502554; Wed, 30 Sep 2026 17:20:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790788853; cv=none; b=mQ222TKf5HlMjqIpWAz2f58+PMcs9VhpU8jPKfvav1l5DPPPANbToBCa0j4ELf/DX7PUCFl5AkA2HpBgkHTD3EfriufBpi70C4IevxOu5kU/a/AlU4GqZ/MczK5g92Xulsf+25u1Cr9GcRhxQeNG9eEf2tozkn2c7jO/IxfrzFs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790788853; c=relaxed/simple; bh=E+NobOUgGKt8nAHSTidEYr+lN7iCYANa9liR/Nj4iFw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=omzt81SPKSYQIiMZsgdUs521e9kHYJDou/LqqjV6Hwirgri9IKXWx2mPwu2P4cZ4eHms9RZQCqWsc863YJXdtzNDZx4Arnek9iP1vrjPGuJP8ulRTMp0XxWjh1PXc2zr8i94fkpABBFU3aJzRmYxfE1lry3N0EpzZF6tY9vGKws= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LoXGG6SC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="LoXGG6SC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC3201F000FF; Wed, 30 Sep 2026 17:20:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790788852; bh=RINieRdJUkowiqIDbFplXJLLkr+Ti9mqyPpXJS7Y11U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LoXGG6SCSPHp8zi0d5QzoD3HxMnCSKO5+lgbG0xxHCxRSpku4b94vmGn6lQs2Ves+ GmBU3gH52PvQauCYkMw7nd+fr/63Xp9lCRvwKikFZ7YLEyHfGwQH91Qg/DQS8hr2bS 1mvzbikstuTCYLl8DNEoB4v1DhZIFn7GmnVIah5s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+af177aa139efdd13a9da@syzkaller.appspotmail.com, Rik van Riel , syzbot+dcaca020ca8377e7ced0@syzkaller.appspotmail.com, Johannes Berg Subject: [PATCH 6.12 272/877] wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver Date: Wed, 30 Sep 2026 17:19:43 +0200 Message-ID: <20260930152420.591942786@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152414.738996857@linuxfoundation.org> References: <20260930152414.738996857@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rik van Riel commit da2ca406f45a6e21760243152ed8d2e8e72915c2 upstream. ieee80211_set_bitrate_mask() checks if the interface is running via ieee80211_sdata_running(), but it does not check if the interface is still present in the driver. When sdata is running but IEEE80211_SDATA_IN_DRIVER is not set, the call reaches drv_set_bitrate_mask() in driver-ops.h which hits wlan1: Failed check-sdata-in-driver check, flags: 0x0 WARNING: net/mac80211/driver-ops.h:884 at drv_set_bitrate_mask Syzkaller triggers this via wext SIOCSIWRATE ioctl. The Call Trace shows wext_ioctl_dispatch() in wext-core.c dispatching the ioctl, calling ioctl_standard_call() for SIOCSIWRATE, which calls cfg80211_wext_siwrate() in wext-compat.c. That builds a bitrate mask and calls rdev_set_bitrate_mask() which ends up in ieee80211_set_bitrate_mask() in cfg.c. The interface is marked running via SDATA_STATE_RUNNING but flags is 0, so check_sdata_in_driver() fails. When the interface is being torn down, or when wext ioctl is issued during interface bringup before drv_add_interface() sets IN_DRIVER, the running check passes while IN_DRIVER is clear. Check IEEE80211_SDATA_IN_DRIVER in ieee80211_set_bitrate_mask() before calling the driver, returning -ENETDOWN. This avoids the WARN_ONCE in driver-ops.h and matches other cfg.c operations that bail early when not in driver. This change should be safe because wiphy mutex is held in cfg80211_wext_siwrate() via guard(wiphy), and IN_DRIVER is set/cleared under RTNL and wiphy paths in drv_add_interface() and drv_remove_interface() in driver-ops.c, so the check is race-free against driver add/remove. Returning -ENETDOWN is the same error other not-running paths use and does not introduce new locking. Reported-by: syzbot+af177aa139efdd13a9da@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=af177aa139efdd13a9da Link: https://lore.kernel.org/all/6a75205c.59b6c763.2bba34.00c3.GAE@google.com/ Fixes: 554a43d5e77e ("mac80211: check sdata_running on ieee80211_set_bitrate_mask") Cc: stable@vger.kernel.org Assisted-by: Hermes:muse-spark-1.2 syzkaller Signed-off-by: Rik van Riel Link: https://patch.msgid.link/20260808104755.319c686e@fangorn Reported-by: syzbot+dcaca020ca8377e7ced0@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=dcaca020ca8377e7ced0 [also add second syzbot report] Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- net/mac80211/cfg.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -3426,6 +3426,9 @@ static int ieee80211_set_bitrate_mask(st if (!ieee80211_sdata_running(sdata)) return -ENETDOWN; + if (!(sdata->flags & IEEE80211_SDATA_IN_DRIVER)) + return -ENETDOWN; + /* * If active validate the setting and reject it if it doesn't leave * at least one basic rate usable, since we really have to be able