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 82BDF3BC8EB; Mon, 5 May 2025 23:22:54 +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=1746487374; cv=none; b=DBFa2NafcTZg7tfftiX0I++qMkUixIO8xcF10CqHzYYEJHPN2hDJ8olbj+SUK+vTtBfSdVcp29jx+vDmYfcaar1N09YxHmIR6qhbEEqCSsNsYKjzAo+TRIA7YqagBcmpjieOVCnR77SUpl0BCvOZv4v5hk9IrBQN1sUevRDUPGI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746487374; c=relaxed/simple; bh=nkV0XuP2UmH+YAEtwRszRvh/4U5zUqzdGszDws1FZOA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=dloRZpk/FwufoAU5+9Ty1Bq/X6NVvpBhxmcqehJ16O4coyxzQCr2IA8P1ZU2VTlSUZJn3bIO5w/e86pSu90P6K9ngyfKjh9Z/3k87IAznjehSUuk1kaW8Zxj3cWThxR+n36l29ugqRuYvcjJ7yUMokIoSb2OrCbsPU89mO4sCBI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y++DsvZX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Y++DsvZX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50F36C4CEEE; Mon, 5 May 2025 23:22:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746487374; bh=nkV0XuP2UmH+YAEtwRszRvh/4U5zUqzdGszDws1FZOA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y++DsvZXaeISGXG1UN6E1F1iVGSvt378Vx26a9QR3mBQQkXyv0fg3sVSlWHcQsemS xtahFJrjB6WFq75x2aPhLwqWz68DXbGBhu+guvg9k/FljYpgwfkU6jRRL2PZfiyJti ExWLelTEsNXmmU0ETVcY05RdyFXEBjaaCdgchdRT845DDapQuq8as6cRKdjU+bnrvA cOf6SWa86EzXkPet+eAWT/vGdYWpacmzmKHx6gtjRIOMoQk4Zof8TgxjLoH1AG9UJP ZxVG1uyEjwCA7lzbd98vdRN3KCE8PJGgYQtImDDt7Gh4NKXjpSqd38V9uu/0oxdqjw TZu1X0Tt2TnZg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peter Seiderer , Simon Horman , Paolo Abeni , Sasha Levin , davem@davemloft.net, edumazet@google.com, kuba@kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 36/79] net: pktgen: fix mpls maximum labels list parsing Date: Mon, 5 May 2025 19:21:08 -0400 Message-Id: <20250505232151.2698893-36-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505232151.2698893-1-sashal@kernel.org> References: <20250505232151.2698893-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.4.293 Content-Transfer-Encoding: 8bit From: Peter Seiderer [ Upstream commit 2b15a0693f70d1e8119743ee89edbfb1271b3ea8 ] Fix mpls maximum labels list parsing up to MAX_MPLS_LABELS entries (instead of up to MAX_MPLS_LABELS - 1). Addresses the following: $ echo "mpls 00000f00,00000f01,00000f02,00000f03,00000f04,00000f05,00000f06,00000f07,00000f08,00000f09,00000f0a,00000f0b,00000f0c,00000f0d,00000f0e,00000f0f" > /proc/net/pktgen/lo\@0 -bash: echo: write error: Argument list too long Signed-off-by: Peter Seiderer Reviewed-by: Simon Horman Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/core/pktgen.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 5e9bd9d80b393..e7cde4f097908 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -805,6 +805,10 @@ static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev) pkt_dev->nr_labels = 0; do { __u32 tmp; + + if (n >= MAX_MPLS_LABELS) + return -E2BIG; + len = hex32_arg(&buffer[i], 8, &tmp); if (len <= 0) return len; @@ -816,8 +820,6 @@ static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev) return -EFAULT; i++; n++; - if (n >= MAX_MPLS_LABELS) - return -E2BIG; } while (c == ','); pkt_dev->nr_labels = n; -- 2.39.5