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Date: Fri, 17 Jun 2022 18:00:55 +0200 From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> To: "Gustavo A. R. Silva" <gustavoars@...nel.org>, Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen <anthony.l.nguyen@...el.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org> Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [Intel-wired-lan] [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info Hi all, Friendly ping (after more than a year after I sent this patch :O): Who can review and/or take this patch, please? Thanks -- Gustavo On 5/26/21 01:04, Gustavo A. R. Silva wrote: > There is a regular need in the kernel to provide a way to declare having a > dynamically sized set of trailing elements in a structure. Kernel code > should always use “flexible array members”[1] for these cases. The older > style of one-element or zero-length arrays should no longer be used[2]. > > Refactor the code according to the use of a flexible-array member in struct > virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element array, > and use the flex_array_size() helper. > > [1] https://en.wikipedia.org/wiki/Flexible_array_member > [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays > > Link: https://github.com/KSPP/linux/issues/79 > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org> > --- > drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +- > drivers/net/ethernet/intel/iavf/iavf_client.c | 2 +- > drivers/net/ethernet/intel/iavf/iavf_client.h | 2 +- > include/linux/avf/virtchnl.h | 8 ++++---- > 4 files changed, 7 insertions(+), 7 deletions(-) > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c > index c0afac8cf33b..6c55fe9cc132 100644 > --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c > +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c > @@ -515,7 +515,7 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf, > > kfree(vf->qvlist_info); > vf->qvlist_info = kzalloc(struct_size(vf->qvlist_info, qv_info, > - qvlist_info->num_vectors - 1), > + qvlist_info->num_vectors), > GFP_KERNEL); > if (!vf->qvlist_info) { > ret = -ENOMEM; > diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.c b/drivers/net/ethernet/intel/iavf/iavf_client.c > index 0c77e4171808..e70da05ef322 100644 > --- a/drivers/net/ethernet/intel/iavf/iavf_client.c > +++ b/drivers/net/ethernet/intel/iavf/iavf_client.c > @@ -470,7 +470,7 @@ static int iavf_client_setup_qvlist(struct iavf_info *ldev, > > v_qvlist_info = (struct virtchnl_iwarp_qvlist_info *)qvlist_info; > msg_size = struct_size(v_qvlist_info, qv_info, > - v_qvlist_info->num_vectors - 1); > + v_qvlist_info->num_vectors); > > adapter->client_pending |= BIT(VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP); > err = iavf_aq_send_msg_to_pf(&adapter->hw, > diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.h b/drivers/net/ethernet/intel/iavf/iavf_client.h > index 9a7cf39ea75a..b14a82b65626 100644 > --- a/drivers/net/ethernet/intel/iavf/iavf_client.h > +++ b/drivers/net/ethernet/intel/iavf/iavf_client.h > @@ -53,7 +53,7 @@ struct iavf_qv_info { > > struct iavf_qvlist_info { > u32 num_vectors; > - struct iavf_qv_info qv_info[1]; > + struct iavf_qv_info qv_info[]; > }; > > #define IAVF_CLIENT_MSIX_ALL 0xFFFFFFFF > diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h > index 85a687bc6096..15b982911321 100644 > --- a/include/linux/avf/virtchnl.h > +++ b/include/linux/avf/virtchnl.h > @@ -658,10 +658,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info); > > struct virtchnl_iwarp_qvlist_info { > u32 num_vectors; > - struct virtchnl_iwarp_qv_info qv_info[1]; > + struct virtchnl_iwarp_qv_info qv_info[]; > }; > > -VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info); > +VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_iwarp_qvlist_info); > > /* VF reset states - these are written into the RSTAT register: > * VFGEN_RSTAT on the VF > @@ -1069,8 +1069,8 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode, > err_msg_format = true; > break; > } > - valid_len += ((qv->num_vectors - 1) * > - sizeof(struct virtchnl_iwarp_qv_info)); > + valid_len += flex_array_size(qv, qv_info, > + qv->num_vectors); > } > break; > case VIRTCHNL_OP_CONFIG_RSS_KEY:
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