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41 lines
1.2 KiB
41 lines
1.2 KiB
From 5fe54ca701a38e283faf840903e9ed20eba8a6f4 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Thu, 5 Dec 2019 16:01:29 +0100
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Subject: [PATCH] xtables-translate: Guard strcpy() call in xlate_ifname()
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The function potentially fed overlong strings to strcpy(). Given that
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everything needed to avoid this is there, reorder code a bit to prevent
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those inputs, too.
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Fixes: 0ddd663e9c167 ("iptables-translate: add in/out ifname wildcard match translation to nft")
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(cherry picked from commit 2861bdbbf062071487a49103513d129ce40e2652)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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iptables/xtables-translate.c | 5 ++---
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1 file changed, 2 insertions(+), 3 deletions(-)
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diff --git a/iptables/xtables-translate.c b/iptables/xtables-translate.c
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index a42c60a3b64c6..77a186b905d73 100644
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--- a/iptables/xtables-translate.c
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+++ b/iptables/xtables-translate.c
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@@ -32,14 +32,13 @@
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void xlate_ifname(struct xt_xlate *xl, const char *nftmeta, const char *ifname,
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bool invert)
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{
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+ int ifaclen = strlen(ifname);
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char iface[IFNAMSIZ];
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- int ifaclen;
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- if (ifname[0] == '\0')
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+ if (ifaclen < 1 || ifaclen >= IFNAMSIZ)
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return;
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strcpy(iface, ifname);
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- ifaclen = strlen(iface);
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if (iface[ifaclen - 1] == '+')
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iface[ifaclen - 1] = '*';
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--
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2.24.0
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