From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 32144176AAF; Wed, 3 Jul 2024 11:14:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005248; cv=none; b=JRNtgYNPJ+nBlp9xEqOnRZDuYbItnARE1bkYGkA1HMiBhcdqJg9mq33NTBzl+SfdcHf9qRcp2rw82+Rm+UOnX82NZvoQdhUsGkpmoI23smS9wasq+P4vcD/fKBHYIjW9vUvHjoX+SRtst6zOSWoz9VACtOjzFjPeYMzVN2dU15U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005248; c=relaxed/simple; bh=S7Gm3OwtFgK9f8h3UgZ0vkis5D4P7mfs/IxjbE7SFcY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iX5KBsoV5x3CFBC5IZgTpIWaHztQnwxFA/JzH1rSdiYKO8nu6Lrcub4KX9NRHeyjeQSucX6fZmcCUFfeCcZVvdmAeV428H6Q5ghd0nfAYUq5RdzgenfT8i0GrBpV9f1kPwNdo4KnermdRdkMNN6Oetj40vEefFbpwBRxfZgws2s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EkPfttqb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="EkPfttqb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA881C32781; Wed, 3 Jul 2024 11:14:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720005248; bh=S7Gm3OwtFgK9f8h3UgZ0vkis5D4P7mfs/IxjbE7SFcY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EkPfttqbyGI1KTpKEiBwc0pcgl4Zg8KwM8MghX+S1G8kTXFDHNhUvfCxPPL8StE/+ ICxYGmEFVyxA7M+/JSm5R3FirzDOVeJA58+Y5BHtXP7gD5qk76JfzG7LTMh+1ab00T 9tl6btyU/QJE2x8e40Dcete47G5qZHT6dk9ZK2qY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Noam Rathaus , Eric Dumazet , Vinicius Costa Gomes , Vladimir Oltean , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 018/356] net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP Date: Wed, 3 Jul 2024 12:35:54 +0200 Message-ID: <20240703102913.789349453@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102913.093882413@linuxfoundation.org> References: <20240703102913.093882413@linuxfoundation.org> User-Agent: quilt/0.67 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: Eric Dumazet [ Upstream commit f921a58ae20852d188f70842431ce6519c4fdc36 ] If one TCA_TAPRIO_ATTR_PRIOMAP attribute has been provided, taprio_parse_mqprio_opt() must validate it, or userspace can inject arbitrary data to the kernel, the second time taprio_change() is called. First call (with valid attributes) sets dev->num_tc to a non zero value. Second call (with arbitrary mqprio attributes) returns early from taprio_parse_mqprio_opt() and bad things can happen. Fixes: a3d43c0d56f1 ("taprio: Add support adding an admin schedule") Reported-by: Noam Rathaus Signed-off-by: Eric Dumazet Acked-by: Vinicius Costa Gomes Reviewed-by: Vladimir Oltean Link: https://lore.kernel.org/r/20240604181511.769870-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sched/sch_taprio.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index e40b4425eb6b5..4a0986843fb5d 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -947,16 +947,13 @@ static int taprio_parse_mqprio_opt(struct net_device *dev, { int i, j; - if (!qopt && !dev->num_tc) { - NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary"); - return -EINVAL; - } - - /* If num_tc is already set, it means that the user already - * configured the mqprio part - */ - if (dev->num_tc) + if (!qopt) { + if (!dev->num_tc) { + NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary"); + return -EINVAL; + } return 0; + } /* Verify num_tc is not out of max range */ if (qopt->num_tc > TC_MAX_QUEUE) { -- 2.43.0