From nobody Sat Feb 7 15:12:13 2026 Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (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 4FF9731196D for ; Sun, 18 Jan 2026 23:10:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.69 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768777845; cv=none; b=KxhczWK1JzO00SqKqLZhPPkBUpx9Xq2hfHZ3/7Imv08snaQzzzGA6yIV+xNHUbBisBOSpIv4qUasKVi05GvTqptugcHg6yqcGU0cluOoRcwQQzJaQxltkijuGYwTycxGW9rA4RH6brmQiGnG1zK8stmFtRnAjP3Q70RsD2AgoYk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768777845; c=relaxed/simple; bh=ZqrECUPocfXpX5D01UbCeWAiHb5AsCoR/ZIzcuaOqng=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=LbJPlsgw50oxOiq+xMolK1nzwPL0oRf8P0FMPvgC3vAHkgKlmOWs6SabdWE0zBvkhAg4EEjKdDqwUQScdnxgbotFLFkctV2lphr1THkaXnGYplynJlvRrAyeC9qdvk9Zt2tCSWq5kJ9BVqUx9KYPgnyfGbNWzrn61Yb1aKp9Mis= 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=209.85.161.69 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-oo1-f69.google.com with SMTP id 006d021491bc7-6610d312bc3so10957754eaf.3 for ; Sun, 18 Jan 2026 15:10:44 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768777843; x=1769382643; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bq3X5kri1FCoJzMSlRV4g72rXs6T5NsQmM9DMfshgDk=; b=wjKfnLpYmXh6xCBOTMdrM1Elf9uVlOA+uuYwEiMLFrU5VsdpPohqZ9wBoDGljT1JtP v5qGMpP9cQC8c9uHFH/DZ2BZCCi+uiyR2kBdn9KfkwKuhG4OxQwc1q8JTH95s60ChTOH sRBY0MaFHE+B11l8O3bC/3BaHmQvphIbficcxuKMaeS1owCQx8Oz8R5IyuvluvnfS0ka LaOU4/OVMtmdLi5v6lMy26ocQVDyMA4JlkBsFyUa+UVAkwnm0pYZcPvyNEkTvyeZIsiE AHE1fYP0w3mbV/lm8q3Pjr8x8GYN17EVRAqhu7NfyaUoO1aPoFJ8DrBThli/T+owSZic hkpQ== X-Gm-Message-State: AOJu0YzJF/RNzau43i6JhJr+eDPyWF3DcAkChp89jX8KlpvuEZT45Qva lFMmsqyN3DYbw3kLERRK86F8MROaTV17xdRzgFhBTyOjaXvwE9j2ICpM1/wHN3Cqftq4+/rLA4P 0vsv0aG8WUmm987RYThDVZnF/E8YjIOi4k/ut/4cggxg6osaJSopXkJ6mlqw= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:160a:b0:659:9a49:8f54 with SMTP id 006d021491bc7-6611796e7d4mr4128171eaf.25.1768777843378; Sun, 18 Jan 2026 15:10:43 -0800 (PST) Date: Sun, 18 Jan 2026 15:10:43 -0800 In-Reply-To: <696d4ffd.050a0220.3390f1.0024.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <696d6873.050a0220.3390f1.002f.GAE@google.com> Subject: Forwarded: Private message regarding: [syzbot] [wireless?] WARNING in drv_get_tsf (2) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable 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: Private message regarding: [syzbot] [wireless?] WARNING in drv_get= _tsf (2) Author: kapoorarnav43@gmail.com #syz test From 0cd0a5cff75a12d3cf1fa0675950ef0dcc647799 Mon Sep 17 00:00:00 2001 From: Arnav Kapoor Date: Mon, 19 Jan 2026 03:03:18 +0530 Subject: [PATCH] mac80211: Fix WARNING in drv_get_tsf debugfs access The debugfs tsf read function was calling drv_get_tsf() even when the interface was not registered with the driver, causing a WARN_ON to be triggered. This is inappropriate for debugfs access. Fix this by checking the IEEE80211_SDATA_IN_DRIVER flag in the debugfs read function and returning -1ULL directly when the interface is not in the driver, avoiding the warning. Reported-by: syzbot+15f88dfa580000@syzkaller.appspotmail.com Signed-off-by: Arnav Rawat --- net/mac80211/debugfs_netdev.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index 30a5a978a..669e7c519 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -656,7 +656,10 @@ static ssize_t ieee80211_if_fmt_tsf( struct ieee80211_local *local =3D sdata->local; u64 tsf; =20 - tsf =3D drv_get_tsf(local, (struct ieee80211_sub_if_data *)sdata); + if (!(sdata->flags & IEEE80211_SDATA_IN_DRIVER)) + tsf =3D -1ULL; + else + tsf =3D drv_get_tsf(local, (struct ieee80211_sub_if_data=20 *)sdata); =20 return scnprintf(buf, buflen, "0x%016llx\n", (unsigned long long)=20 tsf); } --=20 2.43.0 On Monday, 19 January 2026 at 04:32:04 UTC+5:30 syzbot wrote: Hello,=20 syzbot tried to test the proposed patch but the build/boot failed:=20 net/mac80211/debugfs_netdev.c:662:70: error: expected ')' before 'return'=20 net/mac80211/debugfs_netdev.c:665:1: error: expected expression before '}'=20 token=20 net/mac80211/debugfs_netdev.c:664:80: error: expected ';' before '}' token=20 net/mac80211/debugfs_netdev.c:665:1: error: no return statement in function=20 returning non-void [-Werror=3Dreturn-type]=20 Tested on:=20 commit: e84d9601 Merge tag 'for-6.19-rc5-tag' of git://git.ker..=20 git tree: upstream=20 kernel config: https://syzkaller.appspot.com/x/.config?x=3Dae589cd0a6acd9be=20 dashboard link: https://syzkaller.appspot.com/bug?extid=3D2cecf0e829ae2219d= 419=20 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for=20 Debian) 2.40=20 patch: https://syzkaller.appspot.com/x/patch.diff?x=3D1217db9a580000