* [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups
@ 2023-11-28 9:29 Dinghao Liu
2023-11-28 12:53 ` Tariq Toukan
2023-11-30 17:44 ` Simon Horman
0 siblings, 2 replies; 3+ messages in thread
From: Dinghao Liu @ 2023-11-28 9:29 UTC (permalink / raw)
To: dinghao.liu
Cc: Saeed Mahameed, Leon Romanovsky, David S. Miller, Eric Dumazet,
Jakub Kicinski, Paolo Abeni, Rahul Rameshbabu, Zhengchao Shao,
Simon Horman, Aya Levin, Tariq Toukan, netdev, linux-rdma,
linux-kernel
When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
fs_any_create_groups() will free ft->g. However, its caller
fs_any_create_table() will free ft->g again through calling
mlx5e_destroy_flow_table(), which will lead to a double-free.
Fix this by setting ft->g to NULL in fs_any_create_groups().
Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
Changelog:
v2: Setting ft->g to NULL instead of removing the kfree().
---
drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
index be83ad9db82a..6207ffe74233 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
@@ -435,6 +435,7 @@ static int fs_any_create_groups(struct mlx5e_flow_table *ft)
in = kvzalloc(inlen, GFP_KERNEL);
if (!in || !ft->g) {
kfree(ft->g);
+ ft->g = NULL;
kvfree(in);
return -ENOMEM;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups
2023-11-28 9:29 [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups Dinghao Liu
@ 2023-11-28 12:53 ` Tariq Toukan
2023-11-30 17:44 ` Simon Horman
1 sibling, 0 replies; 3+ messages in thread
From: Tariq Toukan @ 2023-11-28 12:53 UTC (permalink / raw)
To: Dinghao Liu
Cc: Saeed Mahameed, Leon Romanovsky, David S. Miller, Eric Dumazet,
Jakub Kicinski, Paolo Abeni, Rahul Rameshbabu, Zhengchao Shao,
Simon Horman, Aya Levin, netdev, linux-rdma, linux-kernel
On 28/11/2023 11:29, Dinghao Liu wrote:
> When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
> fs_any_create_groups() will free ft->g. However, its caller
> fs_any_create_table() will free ft->g again through calling
> mlx5e_destroy_flow_table(), which will lead to a double-free.
> Fix this by setting ft->g to NULL in fs_any_create_groups().
>
> Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> ---
>
> Changelog:
>
> v2: Setting ft->g to NULL instead of removing the kfree().
> ---
> drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
> index be83ad9db82a..6207ffe74233 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
> @@ -435,6 +435,7 @@ static int fs_any_create_groups(struct mlx5e_flow_table *ft)
> in = kvzalloc(inlen, GFP_KERNEL);
> if (!in || !ft->g) {
> kfree(ft->g);
> + ft->g = NULL;
> kvfree(in);
> return -ENOMEM;
> }
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups
2023-11-28 9:29 [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups Dinghao Liu
2023-11-28 12:53 ` Tariq Toukan
@ 2023-11-30 17:44 ` Simon Horman
1 sibling, 0 replies; 3+ messages in thread
From: Simon Horman @ 2023-11-30 17:44 UTC (permalink / raw)
To: Dinghao Liu
Cc: Saeed Mahameed, Leon Romanovsky, David S. Miller, Eric Dumazet,
Jakub Kicinski, Paolo Abeni, Rahul Rameshbabu, Zhengchao Shao,
Aya Levin, Tariq Toukan, netdev, linux-rdma, linux-kernel
On Tue, Nov 28, 2023 at 05:29:01PM +0800, Dinghao Liu wrote:
> When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
> fs_any_create_groups() will free ft->g. However, its caller
> fs_any_create_table() will free ft->g again through calling
> mlx5e_destroy_flow_table(), which will lead to a double-free.
> Fix this by setting ft->g to NULL in fs_any_create_groups().
>
> Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> ---
>
> Changelog:
>
> v2: Setting ft->g to NULL instead of removing the kfree().
Reviewed-by: Simon Horman <horms@kernel.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-11-30 17:44 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-11-28 9:29 [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups Dinghao Liu
2023-11-28 12:53 ` Tariq Toukan
2023-11-30 17:44 ` Simon Horman
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).