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From 9dfd443c3828a3e9a3cf5cf2afb9f0324bacb19a 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 17:51:28 +0100
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Subject: [PATCH] libiptc: NULL-terminate errorname
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1525980
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Upstream Status: iptables commit a76ba54e28337
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commit a76ba54e2833761c46fd57cbe2486cbc38686717
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Author: Phil Sutter <phil@nwl.cc>
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Date: Mon Sep 24 19:25:22 2018 +0200
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libiptc: NULL-terminate errorname
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In struct chain_head, field 'name' is of size TABLE_MAXNAMELEN, hence
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copying its content into 'error_name' field of struct xt_error_target
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which is two bytes shorter may overflow. Make sure this doesn't happen
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by using strncpy() and set the last byte to zero.
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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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libiptc/libiptc.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/libiptc/libiptc.c b/libiptc/libiptc.c
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index f6a9862ea9f4d..d2427c16a5254 100644
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--- a/libiptc/libiptc.c
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+++ b/libiptc/libiptc.c
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@@ -1149,7 +1149,8 @@ static int iptcc_compile_chain(struct xtc_handle *h, STRUCT_REPLACE *repl, struc
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strcpy(head->name.target.u.user.name, ERROR_TARGET);
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head->name.target.u.target_size =
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ALIGN(sizeof(struct xt_error_target));
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- strcpy(head->name.errorname, c->name);
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+ strncpy(head->name.errorname, c->name, XT_FUNCTION_MAXNAMELEN);
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+ head->name.errorname[XT_FUNCTION_MAXNAMELEN - 1] = '\0';
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} else {
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repl->hook_entry[c->hooknum-1] = c->head_offset;
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repl->underflow[c->hooknum-1] = c->foot_offset;
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--
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2.21.0
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