From nobody Sun Feb 8 19:59:16 2026 Received: from mail-oi1-f176.google.com (mail-oi1-f176.google.com [209.85.167.176]) (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 B60B7275B05 for ; Sun, 18 Jan 2026 19:23:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768764207; cv=none; b=uZM6ZjThDYHbfv4WWRd7kt8zz0pth36TAgq+1R91RSvMeBJL6JauRerrx7MrzYy+wEqrsCZ0kltfZOi5gkR0RCmdkw2S3bmR0glV+XF9X0BpYizZM/U1OpZFkhSUsVC3BRw0nCXhedJhbnN0nelnpFaG2qnJffnFTQOz1w1lEBw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768764207; c=relaxed/simple; bh=53UopOiSS5GM7ARutLD39Ovf/BQMy7Mk8S2UQAf9p18=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=LwiG7WJzM6ri2SFW5wswQQiqVr/I1SbqtUNoRF2u52vtwwPSgo/l97BX/oVwdBlHWIUjn5/u18jxwdmJ2UV9JWn2fK8JJWLn4C2GoHNimrDsPPkZwyfycbQNY5S6FZXK80Nh46MvNnI5vdEt2s3EyHYhrdWAnEt8cKZ8LHikQYo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ipBBsQcG; arc=none smtp.client-ip=209.85.167.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ipBBsQcG" Received: by mail-oi1-f176.google.com with SMTP id 5614622812f47-45c798c92edso2272524b6e.1 for ; Sun, 18 Jan 2026 11:23:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1768764204; x=1769369004; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=bDtxksZFS0nrsjFFEzMEftEkeVqAD5J3c5aurgBd+rU=; b=ipBBsQcG+7hi8OD6Ux8WsQ+AjzIwXFUXDHcuF3pWjdu7wNp1S6VUTai0HAuFEXmBA2 4dsWgMtzkUSHHrCOo+8UKiPNr7s+O1Rp+VpnzKPuNfX3XM4Az6dv3r8xX6b7nkOuVyym KrkW2WIRsq9US+LUMNZL+ZQRLx5F+dAQ+LAWSavJdWGiLnQ3IdfVfDsXliLYzZmSow+Y Zehn1xz1N22knkslJSSlt3GFDGtUYiVHuSfYoLGVc9xHxdJREmjktvu4i3e+bu0bexXk wH6NtQS4UJtGCK0j7lZ04dZ62vDlIioejHy8jClGunYlNnWDd2oKqW7RDHO9693T6cuX 9jhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768764204; x=1769369004; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=bDtxksZFS0nrsjFFEzMEftEkeVqAD5J3c5aurgBd+rU=; b=GOKox2KxS+iPiemkPqgJ1pklm1c4bHn2JRaUkY+vGYNPtRP18Ow5ysO04OmhKNBPpk L3Eg86QfyFWH9BXEDUm42mG9F+mnbzRUTdVHLyJSJDP+ql4Lp4Fo8vO3uKUnKkz3rsTQ CwniFzn9jDNId/rKEHhPzOXJ4LJcwWQZ1pHJYVRYjpdDbucE5Vag7Eu2LmijD3huUmUx r1yofGeuTiFCvX/mygStQsIBEXJFSwAy3K21Hs/U79JN8VKws8W1ps1ZP/vLtCL8d6e2 c5f/s5lENnyES9ULNuu+W90B02oV/lz2JuW8V9Y8vCe6/QRMMGXB/uOOFepADXQZKwtk 6M+A== X-Forwarded-Encrypted: i=1; AJvYcCV3HL8TwGHybu/JdpWgNgBhQo+NFP09IGNqQqWphTgbR77Bmds1w8Uc35sis6Vt2BqdQyc8akhyEbhcYSI=@vger.kernel.org X-Gm-Message-State: AOJu0Yx+kVnbwZxIg5HieKLvlfwxPlztgdLoQ82XBejPHX2sAZVHoF7t hE8G0MnQCET4LlAp9DCMK7ZxG1P5J43vFTOcAAG6dSMrVsrGqydrqy7y X-Gm-Gg: AY/fxX4MzAbLqWZ7jXkwwB42H7rqnePSDAF78NjGmNei4TN59iTLWaS5Wkn0usir6F1 tCdpjND5XokOPJSEKIrq32iZzjCvOApGtUehZr3AyVA8d5Fx5rx0EG7oE1vdvPbOIrCnoMvEOJm ew7NQs45ah0Fx2kWa3WTxZvd0SFfleIAD58RAif0PkcO7xmc7cI8j3QEjpLrDfcLbZfhDD14RQY zNj9g/wrRPJTt4vJKoD6yGo+FayrFjC6pulLOn8ATrIT9yn2g5EyuO1EZzSAEHinWm6M85yfEH5 tawoLCVkAJHUJV4OrIojHpJiMQ3tcQWuMIv5PMSVvhB2DrUMFz0pxAi7tdy67eJrQQhEEVvyM4W cKr7mFbG1WdDtkqholcg+jAAZy64tDAk4cfw/Z2KlflVHppcspqtbG4AibyMUF83pxuOKtuTwgp DQgUebfoNkS43HWPzTR5AzCfJW7yBiEHVW X-Received: by 2002:a05:6808:1986:b0:45c:90d8:c843 with SMTP id 5614622812f47-45c9c091394mr4106712b6e.37.1768764204403; Sun, 18 Jan 2026 11:23:24 -0800 (PST) Received: from newman.cs.purdue.edu ([128.10.127.250]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7cfdf000b80sm5543917a34.0.2026.01.18.11.23.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Jan 2026 11:23:23 -0800 (PST) From: Jiasheng Jiang To: Mark Fasheh , Joel Becker , Joseph Qi , linux-kernel@vger.kernel.org Cc: ocfs2-devel@lists.linux.dev, stable@vger.kernel.org, Jiasheng Jiang Subject: [PATCH] ocfs2: fix potential OOB access in ocfs2_adjust_adjacent_records() Date: Sun, 18 Jan 2026 19:23:18 +0000 Message-Id: <20260118192318.44212-1-jiashengjiangcool@gmail.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In ocfs2_adjust_adjacent_records(), the code dereferences right_child_el->l_recs[0] without verifying that the extent list actually contains any records. If right_child_el->l_next_free_rec is 0 (e.g., due to a corrupted filesystem image), this results in an out-of-bounds access when accessing l_recs[0].e_cpos. In contrast, ocfs2_adjust_rightmost_records() explicitly validates that l_next_free_rec is non-zero before accessing records. This patch adds a check to ensure l_next_free_rec is not zero before proceeding. If the list is empty, we log an error and return to avoid reading invalid data. Fixes: dcd0538ff4e8 ("ocfs2: sparse b-tree support") Signed-off-by: Jiasheng Jiang --- fs/ocfs2/alloc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index 58bf58b68955..bc6f26613e6e 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -1974,6 +1974,11 @@ static void ocfs2_adjust_adjacent_records(struct ocf= s2_extent_rec *left_rec, { u32 left_clusters, right_end; =20 + if (le16_to_cpu(right_child_el->l_next_free_rec) =3D=3D 0) { + mlog(ML_ERROR, "Extent list has no records\n"); + return; + } + /* * Interior nodes never have holes. Their cpos is the cpos of * the leftmost record in their child list. Their cluster --=20 2.25.1