inet: ping: use hlist_nulls rcu iterator during lookup

ping_lookup() does not acquire the table spinlock, so iteration should use hlist_nulls_for_each_entry_rcu(). Spotted during code review. Fixes: dbca159 ("ping: convert to RCU lookups, get rid of rwlock") Cc: Eric Dumazet <[email protected]> Signed-off-by: Florian Westphal <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Paolo Abeni <[email protected]>
chewitt · Dec 1, 2022 · c25b7a7 · c25b7a7
1 parent 9aff0ec
commit c25b7a7
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Showing 3 changed files with 7 additions and 4 deletions.
diff --git a/.clang-format b/.clang-format
@@ -535,6 +535,7 @@ ForEachMacros:
   - 'perf_hpp_list__for_each_sort_list_safe'
   - 'perf_pmu__for_each_hybrid_pmu'
   - 'ping_portaddr_for_each_entry'
+  - 'ping_portaddr_for_each_entry_rcu'
   - 'plist_for_each'
   - 'plist_for_each_continue'
   - 'plist_for_each_entry'

diff --git a/include/net/ping.h b/include/net/ping.h
@@ -16,9 +16,6 @@
 #define PING_HTABLE_SIZE 	64
 #define PING_HTABLE_MASK 	(PING_HTABLE_SIZE-1)
 
-#define ping_portaddr_for_each_entry(__sk, node, list) \
-	hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
-
 /*
  * gid_t is either uint or ushort.  We want to pass it to
  * proc_dointvec_minmax(), so it must not be larger than MAX_INT

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
@@ -49,6 +49,11 @@
 #include <net/transp_v6.h>
 #endif
 
+#define ping_portaddr_for_each_entry(__sk, node, list) \
+	hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
+#define ping_portaddr_for_each_entry_rcu(__sk, node, list) \
+	hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
+
 struct ping_table {
 	struct hlist_nulls_head	hash[PING_HTABLE_SIZE];
 	spinlock_t		lock;
@@ -192,7 +197,7 @@ static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
 		return NULL;
 	}
 
-	ping_portaddr_for_each_entry(sk, hnode, hslot) {
+	ping_portaddr_for_each_entry_rcu(sk, hnode, hslot) {
 		isk = inet_sk(sk);
 
 		pr_debug("iterate\n");