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 CB7EB30567C; Thu, 30 Jul 2026 15:19:37 +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=1785424779; cv=none; b=Jh4BG08GqbsiXyz8Fh9BtsLyz5wJ6Yw8rxof6gNro2oeKWK8JowI10R2CmCdg37EEGXJV5NjIH8VFyvKLjbwYogzJG84E/6RgEsqDJ+HZajJxzWw2AwAQrTQeZ6YvronfWRG9m13F351s+2mUq2NM++4ePztPZ9VTacj+3Wg/d8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785424779; c=relaxed/simple; bh=kvB2sfB6tS4wdHzpilccup41Vt/TbeHLmoFhhAUL9LE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rfBq8Kq/r6Mbke3uW6cD2NL2SORx9JgR5azxxUIFNmQyhknft6a/odtdjBz7+znrsGjTRE1trn8QHyt7/OD/aikexoHcjlU6d4tLQTwdjfNQVXZFMVaynSH4jlkOEtA3ecWXyH/BEgUSzNq0GGr7LKgwudamcKt8XYUghCx7NcI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Tiuya6Z8; 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="Tiuya6Z8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B9E41F000E9; Thu, 30 Jul 2026 15:19:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785424777; bh=Tg4cHPw6E4dtV1GjHhOAK5Mu8oyRoLxfgCrchFX/Awg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Tiuya6Z8S+pyFO1jIt5clVSq2pQWwnuBSmnX7qx8ucBgHIoGhWNeKLS3BuYc8gj/s Gc3fak6xl7irAUnBf12ucy9UZ8y4jFWz7nMMvdViqkJqLJAHi7fUpOa53+cO118Od0 CPMJmpc0VlsOls8QrM5zIOg0C+rYn6maYhDhk0eg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuan Tan , Zhengchuan Liang , Xin Liu , Douya Le , Ren Wei , Viacheslav Dubeyko , Ilya Dryomov Subject: [PATCH 6.18 514/675] libceph: bound get_version reply decode to front len Date: Thu, 30 Jul 2026 16:14:04 +0200 Message-ID: <20260730141456.055370774@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141445.110192266@linuxfoundation.org> References: <20260730141445.110192266@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Douya Le commit d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0 upstream. handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received. A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read. Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire. Cc: stable@vger.kernel.org Fixes: 513a8243d67f ("libceph: mon_get_version request infrastructure") Reported-by: Yuan Tan Reported-by: Zhengchuan Liang Reported-by: Xin Liu Assisted-by: Codex:GPT-5.4 Signed-off-by: Douya Le Signed-off-by: Ren Wei Reviewed-by: Viacheslav Dubeyko Signed-off-by: Ilya Dryomov Signed-off-by: Greg Kroah-Hartman --- net/ceph/mon_client.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ceph/mon_client.c +++ b/net/ceph/mon_client.c @@ -821,7 +821,7 @@ static void handle_get_version_reply(str struct ceph_mon_generic_request *req; u64 tid = le64_to_cpu(msg->hdr.tid); void *p = msg->front.iov_base; - void *end = p + msg->front_alloc_len; + void *const end = p + msg->front.iov_len; u64 handle; dout("%s msg %p tid %llu\n", __func__, msg, tid);