This is a note to let you know that I've just added the patch titled
net/mlx5e: fix double free of encap_header
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mlx5e-fix-double-free-of-encap_header.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5d8e204e5193e6c01fb5cef58ad9c7da2000bd70
Author: Dust Li <dust.li@xxxxxxxxxxxxxxxxx>
Date: Tue Nov 14 13:58:36 2023 -0800
net/mlx5e: fix double free of encap_header
[ 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@xxxxxxxxxxxxxxxxx>
Reported-by: Tianchen Ding <dtcccc@xxxxxxxxxxxxxxxxx>
Signed-off-by: Dust Li <dust.li@xxxxxxxxxxxxxxxxx>
Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 00a04fdd756f5..8bca696b6658c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -300,9 +300,6 @@ 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(attr.n, NULL);
/* the encap entry will be made valid on neigh update event
@@ -322,6 +319,8 @@ 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(attr.out_dev));
mlx5e_route_lookup_ipv4_put(&attr);
@@ -568,9 +567,6 @@ 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(attr.n, NULL);
/* the encap entry will be made valid on neigh update event
@@ -590,6 +586,8 @@ 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(attr.out_dev));
mlx5e_route_lookup_ipv6_put(&attr);
