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ipv4: prevent potential spectre v1 gadget in ip_metrics_convert()

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[ Upstream commit 1d1d63b612 ]

if (!type)
		continue;
	if (type > RTAX_MAX)
		return -EINVAL;
	...
	metrics[type - 1] = val;

@type being used as an array index, we need to prevent
cpu speculation or risk leaking kernel memory content.

Fixes: 6cf9dfd3bd ("net: fib: move metrics parsing to a helper")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230120133040.3623463-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2023-01-20 13:30:40 +00:00 committed by Greg Kroah-Hartman
parent ead06e3449
commit d50e7348b4
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/metrics.c
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@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/netlink.h>
#include <linux/nospec.h>
#include <linux/rtnetlink.h>
#include <linux/types.h>
#include <net/ip.h>
@ -28,6 +29,7 @@ static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
return -EINVAL;
}
type = array_index_nospec(type, RTAX_MAX + 1);
if (type == RTAX_CC_ALGO) {
char tmp[TCP_CA_NAME_MAX];