After all this patch is not fixing it all. If we get to default of the switch
statement we will free invalid pointer so removing ack-ed by me.
The previous patch by Colin King fixes it.
-----Original Message-----
From: Eli Cohen <e...@mellanox.com>
Sent: Sunday, August 9, 2020 8:53 AM
To: Alex Dewar <alex.dewa...@gmail.com>
Cc: Michael S. Tsirkin <m...@redhat.com>; Jason Wang <jasow...@redhat.com>;
Parav Pandit <pa...@mellanox.com>; virtualizat...@lists.linux-foundation.org;
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] vdpa/mlx5: Fix erroneous null pointer checks
Acked-by: Eli Cohen <e...@mellanox.com>
On Thu, Aug 06, 2020 at 08:18:39PM +0100, Alex Dewar wrote:
> In alloc_inout() in net/mlx5_vnet.c, there are a few places where
> memory is allocated to *in and *out, but only the values of in and out
> are null-checked (i.e. there is a missing dereference). Fix this.
>
> Addresses-Coverity: ("CID 1496603: (REVERSE_INULL)")
> Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5
> devices")
> Signed-off-by: Alex Dewar <alex.dewa...@gmail.com>
> ---
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 3ec44a4f0e45..bcb6600c2839 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -867,7 +867,7 @@ static void alloc_inout(struct mlx5_vdpa_net *ndev, int
> cmd, void **in, int *inl
> *outlen = MLX5_ST_SZ_BYTES(qp_2rst_out);
> *in = kzalloc(*inlen, GFP_KERNEL);
> *out = kzalloc(*outlen, GFP_KERNEL);
> - if (!in || !out)
> + if (!*in || !*out)
> goto outerr;
>
> MLX5_SET(qp_2rst_in, *in, opcode, cmd); @@ -879,7 +879,7 @@
> static
> void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int *inl
> *outlen = MLX5_ST_SZ_BYTES(rst2init_qp_out);
> *in = kzalloc(*inlen, GFP_KERNEL);
> *out = kzalloc(MLX5_ST_SZ_BYTES(rst2init_qp_out), GFP_KERNEL);
> - if (!in || !out)
> + if (!*in || !*out)
> goto outerr;
>
> MLX5_SET(rst2init_qp_in, *in, opcode, cmd); @@ -896,7 +896,7 @@
> static void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int
> *inl
> *outlen = MLX5_ST_SZ_BYTES(init2rtr_qp_out);
> *in = kzalloc(*inlen, GFP_KERNEL);
> *out = kzalloc(MLX5_ST_SZ_BYTES(init2rtr_qp_out), GFP_KERNEL);
> - if (!in || !out)
> + if (!*in || !*out)
> goto outerr;
>
> MLX5_SET(init2rtr_qp_in, *in, opcode, cmd); @@ -914,7 +914,7 @@
> static void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int
> *inl
> *outlen = MLX5_ST_SZ_BYTES(rtr2rts_qp_out);
> *in = kzalloc(*inlen, GFP_KERNEL);
> *out = kzalloc(MLX5_ST_SZ_BYTES(rtr2rts_qp_out), GFP_KERNEL);
> - if (!in || !out)
> + if (!*in || !*out)
> goto outerr;
>
> MLX5_SET(rtr2rts_qp_in, *in, opcode, cmd);
> --
> 2.28.0
>
