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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: dbca1596bb
("ping: convert to RCU lookups, get rid of rwlock")
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Link: https://lore.kernel.org/r/20221129140644.28525-1-fw@strlen.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
parent
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commit
c25b7a7a56
@ -535,6 +535,7 @@ ForEachMacros:
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- 'perf_hpp_list__for_each_sort_list_safe'
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- 'perf_pmu__for_each_hybrid_pmu'
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- 'ping_portaddr_for_each_entry'
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- 'ping_portaddr_for_each_entry_rcu'
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- 'plist_for_each'
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- 'plist_for_each_continue'
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- 'plist_for_each_entry'
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@ -16,9 +16,6 @@
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#define PING_HTABLE_SIZE 64
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#define PING_HTABLE_MASK (PING_HTABLE_SIZE-1)
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#define ping_portaddr_for_each_entry(__sk, node, list) \
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hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
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/*
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* gid_t is either uint or ushort. We want to pass it to
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* proc_dointvec_minmax(), so it must not be larger than MAX_INT
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@ -49,6 +49,11 @@
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#include <net/transp_v6.h>
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#endif
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#define ping_portaddr_for_each_entry(__sk, node, list) \
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hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
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#define ping_portaddr_for_each_entry_rcu(__sk, node, list) \
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hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
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struct ping_table {
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struct hlist_nulls_head hash[PING_HTABLE_SIZE];
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spinlock_t lock;
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@ -192,7 +197,7 @@ static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
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return NULL;
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}
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ping_portaddr_for_each_entry(sk, hnode, hslot) {
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ping_portaddr_for_each_entry_rcu(sk, hnode, hslot) {
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isk = inet_sk(sk);
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pr_debug("iterate\n");
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