5.4-stable review patch. If anyone has any objections, please let me know.
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From: Dust Li dust.li@linux.alibaba.com
[ Upstream commit 6f9b1a0731662648949a1c0587f6acb3b7f8acf1 ]
When mlx5_packet_reformat_alloc() fails, the encap_header allocated in mlx5e_tc_tun_create_header_ipv4{6} will be released within it. However, e->encap_header is already set to the previously freed encap_header before mlx5_packet_reformat_alloc(). As a result, the later mlx5e_encap_put() will free e->encap_header again, causing a double free issue.
mlx5e_encap_put() --> mlx5e_encap_dealloc() --> kfree(e->encap_header)
This happens when cmd: MLX5_CMD_OP_ALLOC_PACKET_REFORMAT_CONTEXT fail.
This patch fix it by not setting e->encap_header until mlx5_packet_reformat_alloc() success.
Fixes: d589e785baf5e ("net/mlx5e: Allow concurrent creation of encap entries") Reported-by: Cruz Zhao cruzzhao@linux.alibaba.com Reported-by: Tianchen Ding dtcccc@linux.alibaba.com Signed-off-by: Dust Li dust.li@linux.alibaba.com Reviewed-by: Wojciech Drewek wojciech.drewek@intel.com Signed-off-by: Saeed Mahameed saeedm@nvidia.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 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 362f01bc8372e..5a4bee5253ec1 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c @@ -290,9 +290,6 @@ int mlx5e_tc_tun_create_header_ipv4(struct mlx5e_priv *priv, if (err) goto destroy_neigh_entry;
- e->encap_size = ipv4_encap_size; - e->encap_header = encap_header; - if (!(nud_state & NUD_VALID)) { neigh_event_send(n, NULL); /* the encap entry will be made valid on neigh update event @@ -309,6 +306,8 @@ int mlx5e_tc_tun_create_header_ipv4(struct mlx5e_priv *priv, goto destroy_neigh_entry; }
+ e->encap_size = ipv4_encap_size; + e->encap_header = encap_header; e->flags |= MLX5_ENCAP_ENTRY_VALID; mlx5e_rep_queue_neigh_stats_work(netdev_priv(out_dev)); neigh_release(n); @@ -408,9 +407,6 @@ int mlx5e_tc_tun_create_header_ipv6(struct mlx5e_priv *priv, if (err) goto destroy_neigh_entry;
- e->encap_size = ipv6_encap_size; - e->encap_header = encap_header; - if (!(nud_state & NUD_VALID)) { neigh_event_send(n, NULL); /* the encap entry will be made valid on neigh update event @@ -428,6 +424,8 @@ int mlx5e_tc_tun_create_header_ipv6(struct mlx5e_priv *priv, goto destroy_neigh_entry; }
+ e->encap_size = ipv6_encap_size; + e->encap_header = encap_header; e->flags |= MLX5_ENCAP_ENTRY_VALID; mlx5e_rep_queue_neigh_stats_work(netdev_priv(out_dev)); neigh_release(n);