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78 lines
2.4 KiB
78 lines
2.4 KiB
From 64b18b08a4c7ff6baeca536100e34aacbbafa7f3 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Thu, 26 Oct 2023 18:05:02 +0200
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Subject: [PATCH] set: Do not leave free'd expr_list elements in place
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JIRA: https://issues.redhat.com/browse/RHEL-14149
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Upstream Status: libnftnl commit 3eaa940bc33a3186dc7ba1e30640ec79b5f261b9
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commit 3eaa940bc33a3186dc7ba1e30640ec79b5f261b9
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Author: Phil Sutter <phil@nwl.cc>
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Date: Wed May 31 14:09:09 2023 +0200
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set: Do not leave free'd expr_list elements in place
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When freeing elements, remove them also to prevent a potential UAF.
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Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1685
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Fixes: 3469f09286cee ("src: add NFTNL_SET_EXPRESSIONS")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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src/set.c | 16 ++++++++++++----
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1 file changed, 12 insertions(+), 4 deletions(-)
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diff --git a/src/set.c b/src/set.c
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index c46f827..719e596 100644
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--- a/src/set.c
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+++ b/src/set.c
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@@ -54,8 +54,10 @@ void nftnl_set_free(const struct nftnl_set *s)
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if (s->flags & (1 << NFTNL_SET_USERDATA))
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xfree(s->user.data);
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- list_for_each_entry_safe(expr, next, &s->expr_list, head)
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+ list_for_each_entry_safe(expr, next, &s->expr_list, head) {
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+ list_del(&expr->head);
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nftnl_expr_free(expr);
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+ }
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list_for_each_entry_safe(elem, tmp, &s->element_list, head) {
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list_del(&elem->head);
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@@ -105,8 +107,10 @@ void nftnl_set_unset(struct nftnl_set *s, uint16_t attr)
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break;
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case NFTNL_SET_EXPR:
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case NFTNL_SET_EXPRESSIONS:
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- list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
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+ list_for_each_entry_safe(expr, tmp, &s->expr_list, head) {
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+ list_del(&expr->head);
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nftnl_expr_free(expr);
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+ }
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break;
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default:
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return;
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@@ -210,8 +214,10 @@ int nftnl_set_set_data(struct nftnl_set *s, uint16_t attr, const void *data,
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s->user.len = data_len;
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break;
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case NFTNL_SET_EXPR:
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- list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
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+ list_for_each_entry_safe(expr, tmp, &s->expr_list, head) {
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+ list_del(&expr->head);
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nftnl_expr_free(expr);
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+ }
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expr = (void *)data;
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list_add(&expr->head, &s->expr_list);
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@@ -742,8 +748,10 @@ int nftnl_set_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_set *s)
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return 0;
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out_set_expr:
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- list_for_each_entry_safe(expr, next, &s->expr_list, head)
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+ list_for_each_entry_safe(expr, next, &s->expr_list, head) {
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+ list_del(&expr->head);
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nftnl_expr_free(expr);
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+ }
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return -1;
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}
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