linux-kernel - Re: [syzbot] [PATCH] Test for 6465e260f487

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Date:   Sat, 18 Nov 2023 21:15:13 -0800
From:   syzbot <syzbot+de4025c006ec68ac56fc@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] Test for 6465e260f487

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***

Subject: [PATCH] Test for 6465e260f487
Author: eadavis@...a.com

please test warn in __nf_unregister_net_hook

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6465e260f487


diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 3126911f5042..58f2a5294453 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -113,6 +113,7 @@ nf_hook_entries_grow(const struct nf_hook_entries *old,
 	alloc_entries = 1;
 	old_entries = old ? old->num_hook_entries : 0;
 
+	mutex_lock(&nf_hook_mutex);
 	if (old) {
 		orig_ops = nf_hook_entries_get_hook_ops(old);
 
@@ -129,17 +130,23 @@ nf_hook_entries_grow(const struct nf_hook_entries *old,
 			 * prevent defrag, conntrack, iptables etc from attaching).
 			 */
 			if (reg->priority == orig_ops[i]->priority &&
-			    reg->hook_ops_type == NF_HOOK_OP_BPF)
-				return ERR_PTR(-EBUSY);
+			    reg->hook_ops_type == NF_HOOK_OP_BPF) {
+				new = ERR_PTR(-EBUSY);
+				goto unlock;
+			}
 		}
 	}
 
-	if (alloc_entries > MAX_HOOK_COUNT)
-		return ERR_PTR(-E2BIG);
+	if (alloc_entries > MAX_HOOK_COUNT) {
+		new = ERR_PTR(-E2BIG);
+		goto unlock;
+	}
 
 	new = allocate_hook_entries_size(alloc_entries);
-	if (!new)
-		return ERR_PTR(-ENOMEM);
+	if (!new) {
+		new = ERR_PTR(-ENOMEM);
+		goto unlock;
+	}
 
 	new_ops = nf_hook_entries_get_hook_ops(new);
 
@@ -170,6 +177,8 @@ nf_hook_entries_grow(const struct nf_hook_entries *old,
 		new->hooks[nhooks].priv = reg->priv;
 	}
 
+unlock:
+	mutex_unlock(&nf_hook_mutex);
 	return new;
 }
 
@@ -546,11 +555,13 @@ void nf_hook_entries_delete_raw(struct nf_hook_entries __rcu **pp,
 {
 	struct nf_hook_entries *p;
 
+	mutex_lock(&nf_hook_mutex);
 	p = rcu_dereference_raw(*pp);
 	if (nf_remove_net_hook(p, reg)) {
 		p = __nf_hook_entries_try_shrink(p, pp);
 		nf_hook_entries_free(p);
 	}
+	mutex_unlock(&nf_hook_mutex);
 }
 EXPORT_SYMBOL_GPL(nf_hook_entries_delete_raw);