linux-kernel - [PATCH AUTOSEL 5.15 070/153] net: pktgen: fix mpls maximum labels list parsing

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Message-Id: <20250505231320.2695319-70-sashal@kernel.org>
Date: Mon,  5 May 2025 19:11:57 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Peter Seiderer <ps.report@....net>,
	Simon Horman <horms@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 070/153] net: pktgen: fix mpls maximum labels list parsing

From: Peter Seiderer <ps.report@....net>

[ 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 <ps.report@....net>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 5d5f03471eb0c..28417fe2a7a2a 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -896,6 +896,10 @@ 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;
@@ -907,8 +911,6 @@ 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