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 7033C341AC7; Sat, 30 May 2026 17:50:32 +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=1780163433; cv=none; b=TFzxMLRvEniSsNOlMTVDxi8X6zxezZSEKQEZTtoACuiBVF6S9OX3Km8fTDHZp3MFB221UE0TUpLZFPEA4NqGoqxu3qyCmpdU/4NMIiSOfBkOxGG7UXSlBLQs8FTjATDCcTk9cbVZHTAeYVlP+zZZUgFR6oIu5JRFw7u1QlW/myA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163433; c=relaxed/simple; bh=WMAau8OiUcpZRS9xuXNkigh3byVlXBqyhA9oXgsn9ck=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iPzCM2vy1QWx/3oWH4sgRtfkSDrfB3XMaqAy/vPEwVqdZV1ocgPNcMcDsCJYGUbqH+TY/93WrWNHbORtphk5NqTamY7sJL7+QnUjbixZcz34tKZqBbJUdwLwdOXoOmRKE8JxbCdoitikQvVSEktVHtl+8foxFNylOs6w2jqlBec= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UCmvNcOP; 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="UCmvNcOP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63FE21F00893; Sat, 30 May 2026 17:50:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780163432; bh=kntr1amWGt/3xxeyFuWQGHcwIFAopF6nE5dTQSYyfqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UCmvNcOPdy7QlkOC1nQlunndqZcahu2uNJa7o+EowF60OMOp1pWfN5pMv2Yf940Z2 7KTageJGfDCUCA6WmZpnLWdDuqbjfUp6yC3OzTNTtWGuJQ5RhkVWGvY0jR/Baj4dmm DHrrQoi21h0/c/4gpQNIqMT904JabJGEyIZasKHc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo , Benjamin Marzinski , Mikulas Patocka Subject: [PATCH 5.15 256/776] dm mirror: fix integer overflow in create_dirty_log() Date: Sat, 30 May 2026 17:59:30 +0200 Message-ID: <20260530160247.152249204@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo commit 4c788c6f921b22f9b6c3f316c4a071c05683e7de upstream. The argument count calculation in create_dirty_log() performs `*args_used = 2 + param_count` before validating against argc. When a user provides a param_count close to UINT_MAX via the device mapper table string, this unsigned addition wraps around to a small value, causing the subsequent `argc < *args_used` check to be bypassed. The overflowed param_count is then passed as argc to dm_dirty_log_create(), where it can cause out-of-bounds reads on the argv array. Fix by comparing param_count against argc - 2 before performing the addition, following the same pattern used by parse_features() in the same file. Since argc >= 2 is already guaranteed, the subtraction is safe. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Reported-by: Yuhao Jiang Signed-off-by: Junrui Luo Reviewed-by: Benjamin Marzinski Signed-off-by: Mikulas Patocka Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-raid1.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/md/dm-raid1.c +++ b/drivers/md/dm-raid1.c @@ -981,13 +981,13 @@ static struct dm_dirty_log *create_dirty return NULL; } - *args_used = 2 + param_count; - - if (argc < *args_used) { + if (param_count > argc - 2) { ti->error = "Insufficient mirror log arguments"; return NULL; } + *args_used = 2 + param_count; + dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count, argv + 2); if (!dl) {