VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Florent Revest <revest@chromium.org> 2023-07-03 16:52:16 +0200 committer: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2023-07-19 16:37:02 +0200 commit: fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7 parent: 14c6b21717f05e39aa2412a26762c1439e05e9cd
Commit Summary:
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
Diffstat:
1 file changed, 4 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 0c4db2f2ac43..f22691f83853 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -360,6 +360,9 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
 	BUG_ON(me->expect_class_max >= NF_CT_MAX_EXPECT_CLASSES);
 	BUG_ON(strlen(me->name) > NF_CT_HELPER_NAME_LEN - 1);
 
+	if (!nf_ct_helper_hash)
+		return -ENOENT;
+
 	if (me->expect_policy->max_expected > NF_CT_EXPECT_MAX_CNT)
 		return -EINVAL;
 
@@ -515,4 +518,5 @@ int nf_conntrack_helper_init(void)
 void nf_conntrack_helper_fini(void)
 {
 	kvfree(nf_ct_helper_hash);
+	nf_ct_helper_hash = NULL;
 }