From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f200.google.com (mail-oi1-f200.google.com [209.85.167.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8946A361977 for ; Thu, 10 Sep 2026 04:07:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789013263; cv=none; b=pEL1gStT3aXjEnqz3eP65K4/pGpectolHSsXYN/z7Urnp52ksXadKEbjlSUZJp0a9aS3joWRwEPqEg7Rmw23j7+Da5yoFHf5sgbibaRLN9GcdK/Nj/1CDsZbtIKZFRLvmMLPPI1qg1jegTB6V9XsCjhV0HVtVWYcWySwMzmCMms= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789013263; c=relaxed/simple; bh=fCa743Q9YcLlzoe4YeE+MEEG8mO1QCD47XapiVzdCro=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=biHEfFJdRFnNcyV+yJjvbrcuLZGzJMlA0sLunGwgGS2YS90+SpgsNKV6MQkXYr1AzIDd4AywUGC8AnQbcL0ZKxfZhtV7KtI0oMz8Mp/0t3deQLwCP7REQ0ssn2n7u7JFhs+vzT+gr7umad0e5aCKC+76AYGT/IZHiekwxpYaIK8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f200.google.com with SMTP id 5614622812f47-4ab7bb257bbso8171786b6e.0 for ; Wed, 09 Sep 2026 21:07:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789013260; x=1789618060; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=fz0Fo3jFb/MBiTiXYkdYyqjl6EDpysPJPmsibOv1j8U=; b=kP2VqyY6s1byyA62LxnZfvOwZCBw1JxzxsAAtTd2jY1Um0Pq01GCXDl2nixeEdEF4V vLjHSuHcW9ShSOtDgKMiL+2QYcXrePPUCtoVzReybF++SDZ/A2rJIlLqchzSO4Fejymo lYGCyay9P9+tb0dGKNCvOH62vnAb+m6TxPj7d47EndU2EdLOdzJz0dCWK1tpyd4K/3y1 HS8OYGHPNlPwieKbpnagjzdUKfbUm6aJC3RzLbOKVurJzUsaHbPSa5oxVjw3VoRpKyn7 DfKkPNOm6xgfktG6/SSeOp/Q2ZYiIM5Jn+aWvpNl7kAvv8h4yMcMyRDcmQAXefE1KE4w CRQQ== X-Gm-Message-State: AFuF++maWsteY9+ew5zae8GynPGx5vglIXdbUu+yw7B/666IIOWBoGKN bShy+6ZEy5lJ8L0zMhga+yseJpIrj+ylxquC4hK21iyThdIsO9v1KsUw3MFH1iTMDZ3LhtdaMT4 Iv/usYytnCX6gL6httCc1ojnTdHsR68OTNnXOhlgZIiQcMGeD528SPaoLcJg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:190b:b0:6b7:83c5:fdf1 with SMTP id 006d021491bc7-6b783c6039amr20914594eaf.50.1789013260155; Wed, 09 Sep 2026 21:07:40 -0700 (PDT) Date: Wed, 09 Sep 2026 21:07:40 -0700 In-Reply-To: <6aa1e15e.f81106d8.2ab401.0003.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa22d0c.f81106d8.2ab401.0005.GAE@google.com> Subject: Forwarded: [PATCH] mac80211: fix using smp_processor_id() in preemptible code in ieee80211_tx_control_port() From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: [PATCH] mac80211: fix using smp_processor_id() in preemptible code in ieee80211_tx_control_port() Author: kartikey406@gmail.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master ieee80211_tx_control_port() can be called from nl80211_tx_control_port() in normal process context via netlink sendmsg(), where BH/preemption is not disabled. dev_sw_netstats_tx_add() uses this_cpu_ptr() internally, which requires preemption to be disabled, triggering a "BUG: using smp_processor_id() in preemptible code" warning. Fix this by moving the local_bh_disable()/local_bh_enable() section to also cover dev_sw_netstats_tx_add() and ieee80211_tpt_led_trig_tx(). Reported-by: syzbot+d979bd35c8a76fd1b6f5@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=d979bd35c8a76fd1b6f5 Signed-off-by: Deepanshu Kartikey --- net/mac80211/tx.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 74ab27534076..7b1a3c63e5dc 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -6687,10 +6687,9 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, return -EINVAL; } + local_bh_disable(); dev_sw_netstats_tx_add(dev, 1, skb->len); ieee80211_tpt_led_trig_tx(local, skb->len); - - local_bh_disable(); ieee80211_xmit(sdata, sta, skb); local_bh_enable(); rcu_read_unlock(); -- 2.34.1