| Message ID | 20231128084303.27227-1-dinghao.liu@zju.edu.cn (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | net/mlx5e: fix a potential double-free in fs_udp_create_groups | expand |
On 28/11/2023 10:43, Dinghao Liu wrote: > When kcalloc() for ft->g succeeds but kvzalloc() for in fails, > fs_udp_create_groups() will free ft->g. However, its caller > fs_udp_create_table() will free ft->g again through calling > mlx5e_destroy_flow_table(), which will lead to a double-free. > Fix this by removing the kfree(ft->g) in fs_udp_create_groups(). > > Fixes: 1c80bd684388 ("net/mlx5e: Introduce Flow Steering UDP API") > Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> > --- > drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 - > 1 file changed, 1 deletion(-) > > 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..806a5093ff63 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 > @@ -153,7 +153,6 @@ static int fs_udp_create_groups(struct mlx5e_flow_table *ft, enum fs_udp_type ty > ft->g = kcalloc(MLX5E_FS_UDP_NUM_GROUPS, sizeof(*ft->g), GFP_KERNEL); > in = kvzalloc(inlen, GFP_KERNEL); > if (!in || !ft->g) { > - kfree(ft->g); > kvfree(in); > return -ENOMEM; > } Same comment applies here. See the other mail thread.
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..806a5093ff63 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 @@ -153,7 +153,6 @@ static int fs_udp_create_groups(struct mlx5e_flow_table *ft, enum fs_udp_type ty ft->g = kcalloc(MLX5E_FS_UDP_NUM_GROUPS, sizeof(*ft->g), GFP_KERNEL); in = kvzalloc(inlen, GFP_KERNEL); if (!in || !ft->g) { - kfree(ft->g); kvfree(in); return -ENOMEM; }
When kcalloc() for ft->g succeeds but kvzalloc() for in fails, fs_udp_create_groups() will free ft->g. However, its caller fs_udp_create_table() will free ft->g again through calling mlx5e_destroy_flow_table(), which will lead to a double-free. Fix this by removing the kfree(ft->g) in fs_udp_create_groups(). Fixes: 1c80bd684388 ("net/mlx5e: Introduce Flow Steering UDP API") Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> --- drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 - 1 file changed, 1 deletion(-)