From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f70.google.com (mail-oo1-f70.google.com [209.85.161.70]) (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 149713B5303 for ; Fri, 17 Apr 2026 10:12:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776420758; cv=none; b=WaKctJDr9G4dQ+RE//p6kgO6Zx8v2+KjvfrgVLZes5fxbFuWZ6HUvoiIwuuHjliJzx+XLRdX03DUlBEwFPHELM1RXyVlsZARYDvYLrUnAIY35TmUQ+rccU372214Axn1wwmiZo/R5SPoFzkn3VAHS8+5xWAX/ydrhO+jKZnLeL8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776420758; c=relaxed/simple; bh=W4CtigPkxDMsispqbi8Y+2foygeM32ZMc7thkfHidpA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=YTUhHnR30k1n5MBvQt4tppFoHdDj9K7C17S6b8I4/mBdQknJHJIArIqRhGHuk2qRpNk5gJT4aZzq+wW8vqt4BQ1gHmGUOT9EF/zps17mhXWY/fMWUD3FFbsKYuSCck2UzyaCTrdk+tVuH9hT7ju22hi0+Lqu9CmklAvsV8oIQdU= 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=209.85.161.70 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-f70.google.com with SMTP id 006d021491bc7-6888581ca85so402060eaf.2 for ; Fri, 17 Apr 2026 03:12:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776420756; x=1777025556; 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=jtkCz6Jc3TZF+Cq2c5T24n4HIv8UQtQT8F+FF9HtE3o=; b=QtsHyu8u0ZDbzlxhrrLdkgfU9KPcPWpbixCPLusIb+Hju/L63VozoibjybsZBb5N0U lv/MoroUhnwvxRxNbJrBMu4iYDMSac8F4jY4wp8rYxxwDxIBPn8Oexz9wjrsEcgP/Nru HDCoKoz8ESa4hf4S8HCHzH0DsMxd2cMskTBuv8TdKXgcWF87uSnk1Ca1Ur1AbZjLdhym YCFl5MKjj8gf73wU8MipNh9HuUbJeubV+EqRpVESn7PG8Pur5rcUszlfLpaZuzGoVpxD gfM4TsIVzH2IGZI3o7p2civnvvVVrbWamm4+GOZShrVdOSnU1JVKmF49LrupxcHhXuwZ A/uQ== X-Gm-Message-State: AOJu0YyBKpmN9Q0HG54PzX05frJNDct/dgZ/Gd8IsZXBIzwx6aTS0HBw hdEvJm8AihparLEQoCF8Pr+cuafvxGc2n+6uRgottUJ54uyydiDdf+3RCJxYBvSLOua6SBOO/kq KQtnlckoDqLBuyLB9WQoaaMj3tRyeSH6DmdQz095XcNr/7FVVjo5zHvQH/7M= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a2:b0:689:d8b0:ccd7 with SMTP id 006d021491bc7-69462e202c3mr1153875eaf.12.1776420756140; Fri, 17 Apr 2026 03:12:36 -0700 (PDT) Date: Fri, 17 Apr 2026 03:12:36 -0700 In-Reply-To: <69651807.050a0220.eaf7.00b2.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e20794.050a0220.1de265.0011.GAE@google.com> Subject: Forwarded: [PATCH] gfs2: replace WARN_ON_ONCE with error message in 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] gfs2: replace WARN_ON_ONCE with error message in Author: tristmd@gmail.com From: Tristan Madani #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master rgblk_free rgblk_free() uses WARN_ON_ONCE to report when gfs2_rbm_from_block() fails to map the starting block to a valid resource group position: if (WARN_ON_ONCE(gfs2_rbm_from_block(&rbm, bstart))) return; On crafted GFS2 images with corrupted resource group metadata, this WARNING fires reliably, producing a full kernel stack trace on every mount attempt. The function already returns early on failure, so the error is handled -- only the WARNING itself is problematic. Replace WARN_ON_ONCE with an fs_warn() message that logs the invalid block number without triggering a kernel WARNING. Reported-by: syzbot+3e2c95229d1ab81a0bfd@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3e2c95229d1ab81a0bfd Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Tristan Madani --- fs/gfs2/rgrp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index XXXXXXX..XXXXXXX 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -2265,7 +2265,10 @@ static void rgblk_free(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd, struct gfs2_bitmap *bi, *bi_prev = NULL; rbm.rgd = rgd; - if (WARN_ON_ONCE(gfs2_rbm_from_block(&rbm, bstart))) + if (gfs2_rbm_from_block(&rbm, bstart)) { + fs_warn(sdp, "rgblk_free: block %llu outside rgrp\n", + (unsigned long long)bstart); return; + } while (blen--) { bi = rbm_bi(&rbm); -- 2.43.0