| Message ID | 20231128092904.2916-1-dinghao.liu@zju.edu.cn (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups | expand |
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>
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>
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; }
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(+)