From: Andrey Ignatov <rdna@fb.com>
To: <bpf@vger.kernel.org>
Cc: Andrey Ignatov <rdna@fb.com>, <ast@kernel.org>,
<daniel@iogearbox.net>, <kafai@fb.com>, <kernel-team@fb.com>
Subject: [PATCH bpf] bpf: Fix memlock accounting for sock_hash
Date: Thu, 11 Jun 2020 17:08:57 -0700 [thread overview]
Message-ID: <20200612000857.2881453-1-rdna@fb.com> (raw)
Add missed bpf_map_charge_init() in sock_hash_alloc() and
correspondingly bpf_map_charge_finish() on ENOMEM.
It was found accidentally while working on unrelated selftest that
checks "map->memory.pages > 0" is true for all map types.
Before:
# bpftool m l
...
3692: sockhash name m_sockhash flags 0x0
key 4B value 4B max_entries 8 memlock 0B
After:
# bpftool m l
...
84: sockmap name m_sockmap flags 0x0
key 4B value 4B max_entries 8 memlock 4096B
Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: Andrey Ignatov <rdna@fb.com>
---
net/core/sock_map.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 17a40a947546..3a2dc6af1d78 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -989,11 +989,15 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)
err = -EINVAL;
goto free_htab;
}
+ err = bpf_map_charge_init(&htab->map.memory, cost);
+ if (err)
+ goto free_htab;
htab->buckets = bpf_map_area_alloc(htab->buckets_num *
sizeof(struct bpf_htab_bucket),
htab->map.numa_node);
if (!htab->buckets) {
+ bpf_map_charge_finish(&htab->map.memory);
err = -ENOMEM;
goto free_htab;
}
--
2.24.1
next reply other threads:[~2020-06-12 0:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-12 0:08 Andrey Ignatov [this message]
2020-06-12 22:26 ` [PATCH bpf] bpf: Fix memlock accounting for sock_hash Alexei Starovoitov
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