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 B22DA31F9B4; Sat, 12 Sep 2026 17:05:23 +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=1789232724; cv=none; b=CQ7HFSAO3tcpauVTZhgIV5n6k3U7xczjYG1gK5MtAonacLZjR1iDMwE15FBJvVVfx5a+rUVeNXRFENnxBZKoChEGg2bWNKt4jtHVshvUvPreI0nr/NF1uis2MqH6ftpH00SduDVEAkgmYpy6Ab0IFwSukBCEwto/81UC5NVvxqI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789232724; c=relaxed/simple; bh=dh93EoKv6lXfcGaD7YMyjNIre39x3OVZh9bofhFAzGY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hjTOsMylwI8extzOvcaWsBBm7f2Scw2IKVTLYAjsJfUurCSNlV5HewUp/cBJdZRxaUl5IK4OVEjl4wFoH9TBCEDv55WKcCNoSMWpA4vVHRByO46LJ99ycokiEMarkgMGmCytTzC9vhjMz+qiwQrQahOXDsggzGTn3xzgQLbFfTY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qkQL8aTe; 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="qkQL8aTe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC5341F000FF; Sat, 12 Sep 2026 17:05:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789232723; bh=UOJPM4R35dIo8pXShfnPwlnW9Ryng8ZdlYK6+TIc/Ks=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=qkQL8aTeuBpMjMBd+OTF1T3osScdurp3SG8awiJePJMZhkPvGKvBzmf0VBG8BTtyH D8ysLZfL+FE3Q7V/MJO9KiybVeuaqVTKAgLqeNRwMKIhyL6yKcyxM3eOBioVKWrAcy MwKqSOl+CJdMg5mDxUKv0rcs1becUvTogsA5oUfs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yichong Chen , Tyler Hicks Subject: [PATCH 5.15 067/935] ecryptfs: fix tag 11 packet exact-fit size check Date: Sat, 12 Sep 2026 08:51:37 +0200 Message-ID: <20260912065528.376333414@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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: Yichong Chen commit 8b2ec0f56f55477f547d332526c9ae2a8fabc0a5 upstream. parse_tag_11_packet() rejects a packet when the already-consumed tag and length bytes plus the packet body exceed the caller supplied maximum packet size. The check currently adds one extra byte, even though *packet_size already includes the tag byte before the length is parsed. Remove the extra byte so a tag 11 packet that exactly fits the available buffer is accepted while oversized packets are still rejected. Fixes: 237fead61998 ("[PATCH] ecryptfs: fs/Makefile and fs/Kconfig") Cc: Signed-off-by: Yichong Chen Signed-off-by: Tyler Hicks Signed-off-by: Greg Kroah-Hartman --- fs/ecryptfs/keystore.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -1576,7 +1576,7 @@ parse_tag_11_packet(unsigned char *data, } (*packet_size) += length_size; (*tag_11_contents_size) = (body_size - 14); - if (unlikely((*packet_size) + body_size + 1 > max_packet_size)) { + if (unlikely((*packet_size) + body_size > max_packet_size)) { printk(KERN_ERR "Packet size exceeds max\n"); rc = -EINVAL; goto out;