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net: pktgen: fix mpls maximum labels list parsing 

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@gmx.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Peter Seiderer 2025-02-27 14:56:00 +01:00 committed by Paolo Abeni
parent 80f6c198df
commit 2b15a0693f
1 changed files with 4 additions and 2 deletions
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6
net/core/pktgen.c
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@ -900,6 +900,10 @@ 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;
@ -911,8 +915,6 @@ 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;