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From f958c3a78f14140e7ee983c3698918fe35f1a7af Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Fri, 15 Mar 2019 17:50:10 +0100
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Subject: [PATCH] libxtables: Fix potential array overrun in
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xtables_option_parse()
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1525980
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Upstream Status: iptables commit 4144571f87c09
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commit 4144571f87c094471419ef59e8bb89ef33cd1365
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Author: Phil Sutter <phil@nwl.cc>
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Date: Mon Sep 10 23:35:13 2018 +0200
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libxtables: Fix potential array overrun in xtables_option_parse()
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If entry->type is to be used as array index, it needs to be at max one
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less than that array's size.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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libxtables/xtoptions.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/libxtables/xtoptions.c b/libxtables/xtoptions.c
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index 78e9abd6a3f47..0c63c2d372dea 100644
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--- a/libxtables/xtoptions.c
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+++ b/libxtables/xtoptions.c
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@@ -864,7 +864,7 @@ void xtables_option_parse(struct xt_option_call *cb)
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* a *RC option type.
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*/
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cb->nvals = 1;
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- if (entry->type <= ARRAY_SIZE(xtopt_subparse) &&
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+ if (entry->type < ARRAY_SIZE(xtopt_subparse) &&
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xtopt_subparse[entry->type] != NULL)
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xtopt_subparse[entry->type](cb);
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/* Exclusion with other flags tested later in finalize. */
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--
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2.21.0
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