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authorJohn Fastabend <john.fastabend@gmail.com>2019-07-19 10:29:20 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2019-07-22 16:04:17 +0200
commit2bb90e5cc90e1d09f631aeab041a9cf913a5bbe5 (patch)
tree2bd6fddc5a229ea3926fffc1fa4841a16f45ad9d /net/core
parent45a4521dcbd92e71c9e53031b40e34211d3b4feb (diff)
bpf: sockmap, synchronize_rcu before free'ing map
We need to have a synchronize_rcu before free'ing the sockmap because any outstanding psock references will have a pointer to the map and when they use this could trigger a use after free. Fixes: 604326b41a6fb ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/sock_map.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 28702f2e9a4a..56bcabe7c2f2 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -247,6 +247,8 @@ static void sock_map_free(struct bpf_map *map)
raw_spin_unlock_bh(&stab->lock);
rcu_read_unlock();
+ synchronize_rcu();
+
bpf_map_area_free(stab->sks);
kfree(stab);
}