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From 1490609a3d82e494168a390b34094bacc5e83c02 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Tue, 18 May 2021 18:06:50 +0200
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Subject: [PATCH] monitor: Fix for use after free when printing map elements
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1919203
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Upstream Status: nftables commit 02174ffad484d
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commit 02174ffad484d9711678e5d415c32307efc39857
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Author: Phil Sutter <phil@nwl.cc>
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Date: Thu Jan 9 17:43:11 2020 +0100
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monitor: Fix for use after free when printing map elements
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When populating the dummy set, 'data' field must be cloned just like
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'key' field.
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Fixes: 343a51702656a ("src: store expr, not dtype to track data in sets")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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src/monitor.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/monitor.c b/src/monitor.c
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index 7927b6f..142cc92 100644
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--- a/src/monitor.c
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+++ b/src/monitor.c
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@@ -401,7 +401,8 @@ static int netlink_events_setelem_cb(const struct nlmsghdr *nlh, int type,
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*/
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dummyset = set_alloc(monh->loc);
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dummyset->key = expr_clone(set->key);
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- dummyset->data = set->data;
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+ if (set->data)
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+ dummyset->data = expr_clone(set->data);
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dummyset->flags = set->flags;
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dummyset->init = set_expr_alloc(monh->loc, set);
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--
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2.31.1
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