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author | 2023-11-21 14:15:30 +0100 | |
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committer | 2023-12-13 17:22:15 -0800 | |
commit | 8e13cd737cb4fbbb37d448e7e5228a99ae08fdc1 (patch) | |
tree | 07d163d2ee242b5359a80bcb8b2f5dc0a39e85a0 | |
parent | Revert "net/mlx5e: fix double free of encap_header" (diff) | |
download | linux-8e13cd737cb4fbbb37d448e7e5228a99ae08fdc1.tar.gz linux-8e13cd737cb4fbbb37d448e7e5228a99ae08fdc1.tar.bz2 linux-8e13cd737cb4fbbb37d448e7e5228a99ae08fdc1.zip |
net/mlx5e: fix double free of encap_header
Cited commit introduced potential double free since encap_header can be
destroyed twice in some cases - once by error cleanup sequence in
mlx5e_tc_tun_{create|update}_header_ipv{4|6}(), once by generic
mlx5e_encap_put() that user calls as a result of getting an error from
tunnel create|update. At the same time the point where e->encap_header is
assigned can't be delayed because the function can still return non-error
code 0 as a result of checking for NUD_VALID flag, which will cause
neighbor update to dereference NULL encap_header.
Fix the issue by:
- Nulling local encap_header variables in
mlx5e_tc_tun_{create|update}_header_ipv{4|6}() to make kfree(encap_header)
call in error cleanup sequence noop after that point.
- Assigning reformat_params.data from e->encap_header instead of local
variable encap_header that was set to NULL pointer by previous step. Also
assign reformat_params.size from e->encap_size for uniformity and in order
to make the code less error-prone in the future.
Fixes: d589e785baf5 ("net/mlx5e: Allow concurrent creation of encap entries")
Reported-by: Dust Li <dust.li@linux.alibaba.com>
Reported-by: Cruz Zhao <cruzzhao@linux.alibaba.com>
Reported-by: Tianchen Ding <dtcccc@linux.alibaba.com>
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
-rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c index 00a04fdd756f..8dfb57f712b0 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c @@ -302,6 +302,7 @@ int mlx5e_tc_tun_create_header_ipv4(struct mlx5e_priv *priv, e->encap_size = ipv4_encap_size; e->encap_header = encap_header; + encap_header = NULL; if (!(nud_state & NUD_VALID)) { neigh_event_send(attr.n, NULL); @@ -313,8 +314,8 @@ int mlx5e_tc_tun_create_header_ipv4(struct mlx5e_priv *priv, memset(&reformat_params, 0, sizeof(reformat_params)); reformat_params.type = e->reformat_type; - reformat_params.size = ipv4_encap_size; - reformat_params.data = encap_header; + reformat_params.size = e->encap_size; + reformat_params.data = e->encap_header; e->pkt_reformat = mlx5_packet_reformat_alloc(priv->mdev, &reformat_params, MLX5_FLOW_NAMESPACE_FDB); if (IS_ERR(e->pkt_reformat)) { @@ -407,6 +408,7 @@ int mlx5e_tc_tun_update_header_ipv4(struct mlx5e_priv *priv, e->encap_size = ipv4_encap_size; kfree(e->encap_header); e->encap_header = encap_header; + encap_header = NULL; if (!(nud_state & NUD_VALID)) { neigh_event_send(attr.n, NULL); @@ -418,8 +420,8 @@ int mlx5e_tc_tun_update_header_ipv4(struct mlx5e_priv *priv, memset(&reformat_params, 0, sizeof(reformat_params)); reformat_params.type = e->reformat_type; - reformat_params.size = ipv4_encap_size; - reformat_params.data = encap_header; + reformat_params.size = e->encap_size; + reformat_params.data = e->encap_header; e->pkt_reformat = mlx5_packet_reformat_alloc(priv->mdev, &reformat_params, MLX5_FLOW_NAMESPACE_FDB); if (IS_ERR(e->pkt_reformat)) { @@ -570,6 +572,7 @@ int mlx5e_tc_tun_create_header_ipv6(struct mlx5e_priv *priv, e->encap_size = ipv6_encap_size; e->encap_header = encap_header; + encap_header = NULL; if (!(nud_state & NUD_VALID)) { neigh_event_send(attr.n, NULL); @@ -581,8 +584,8 @@ int mlx5e_tc_tun_create_header_ipv6(struct mlx5e_priv *priv, memset(&reformat_params, 0, sizeof(reformat_params)); reformat_params.type = e->reformat_type; - reformat_params.size = ipv6_encap_size; - reformat_params.data = encap_header; + reformat_params.size = e->encap_size; + reformat_params.data = e->encap_header; e->pkt_reformat = mlx5_packet_reformat_alloc(priv->mdev, &reformat_params, MLX5_FLOW_NAMESPACE_FDB); if (IS_ERR(e->pkt_reformat)) { @@ -674,6 +677,7 @@ int mlx5e_tc_tun_update_header_ipv6(struct mlx5e_priv *priv, e->encap_size = ipv6_encap_size; kfree(e->encap_header); e->encap_header = encap_header; + encap_header = NULL; if (!(nud_state & NUD_VALID)) { neigh_event_send(attr.n, NULL); @@ -685,8 +689,8 @@ int mlx5e_tc_tun_update_header_ipv6(struct mlx5e_priv *priv, memset(&reformat_params, 0, sizeof(reformat_params)); reformat_params.type = e->reformat_type; - reformat_params.size = ipv6_encap_size; - reformat_params.data = encap_header; + reformat_params.size = e->encap_size; + reformat_params.data = e->encap_header; e->pkt_reformat = mlx5_packet_reformat_alloc(priv->mdev, &reformat_params, MLX5_FLOW_NAMESPACE_FDB); if (IS_ERR(e->pkt_reformat)) { |