diff options
| author | Nikolay Aleksandrov <nikolay@nvidia.com> | 2021-06-10 15:04:10 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-06-30 08:48:25 -0400 |
| commit | 24a6e55f17aa123bc1fc54b7d3c410b41bc16530 (patch) | |
| tree | 8af7b03ea323c8dbc32cf6715833a58fb5c072bb /net/bridge/br_private.h | |
| parent | 534fb8a871c4fa3218303118c38b4e304f8a9fd6 (diff) | |
net: bridge: fix vlan tunnel dst null pointer dereference
commit 58e2071742e38f29f051b709a5cca014ba51166f upstream.
This patch fixes a tunnel_dst null pointer dereference due to lockless
access in the tunnel egress path. When deleting a vlan tunnel the
tunnel_dst pointer is set to NULL without waiting a grace period (i.e.
while it's still usable) and packets egressing are dereferencing it
without checking. Use READ/WRITE_ONCE to annotate the lockless use of
tunnel_id, use RCU for accessing tunnel_dst and make sure it is read
only once and checked in the egress path. The dst is already properly RCU
protected so we don't need to do anything fancy than to make sure
tunnel_id and tunnel_dst are read only once and checked in the egress path.
Cc: stable@vger.kernel.org
Fixes: 11538d039ac6 ("bridge: vlan dst_metadata hooks in ingress and egress paths")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/bridge/br_private.h')
| -rw-r--r-- | net/bridge/br_private.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 33b8222db75c..7ca3b469242e 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -100,8 +100,8 @@ struct br_vlan_stats { }; struct br_tunnel_info { - __be64 tunnel_id; - struct metadata_dst *tunnel_dst; + __be64 tunnel_id; + struct metadata_dst __rcu *tunnel_dst; }; /** |