diff mbox series

[1/4,next] i40e: Replace one-element array with flex-array member in struct i40e_package_header

Message ID 768db2c3764a490118f6850d24f6e49998494b6c.1690938732.git.gustavoars@kernel.org (mailing list archive)
State Mainlined
Commit e55c50eac36a704e9e867257f50cd482e8256755
Headers show
Series i40e: Replace one-element arrays with flexible-array members | expand

Commit Message

Gustavo A. R. Silva Aug. 2, 2023, 5:05 a.m. UTC
One-element and zero-length arrays are deprecated. So, replace
one-element array in struct i40e_package_header with flexible-array
member.

The `+ sizeof(u32)` adjustments ensure that there are no differences
in binary output.

Link: https://github.com/KSPP/linux/issues/335
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/net/ethernet/intel/i40e/i40e_ddp.c  | 4 ++--
 drivers/net/ethernet/intel/i40e/i40e_type.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

Comments

Simon Horman Aug. 2, 2023, 3:18 p.m. UTC | #1
On Tue, Aug 01, 2023 at 11:05:31PM -0600, Gustavo A. R. Silva wrote:
> One-element and zero-length arrays are deprecated. So, replace
> one-element array in struct i40e_package_header with flexible-array
> member.
> 
> The `+ sizeof(u32)` adjustments ensure that there are no differences
> in binary output.
> 
> Link: https://github.com/KSPP/linux/issues/335
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_ddp.c  | 4 ++--
>  drivers/net/ethernet/intel/i40e/i40e_type.h | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_ddp.c b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
> index 7e8183762fd9..0db6f5e3cfcc 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_ddp.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
> @@ -220,7 +220,7 @@ static bool i40e_ddp_is_pkg_hdr_valid(struct net_device *netdev,
>  		netdev_err(netdev, "Invalid DDP profile - size is bigger than 4G");
>  		return false;
>  	}
> -	if (size < (sizeof(struct i40e_package_header) +
> +	if (size < (sizeof(struct i40e_package_header) + sizeof(u32) +

Hi Gustavo,

would it make more sense to use struct_size() here?

>  		sizeof(struct i40e_metadata_segment) + sizeof(u32) * 2)) {
>  		netdev_err(netdev, "Invalid DDP profile - size is too small.");
>  		return false;
> @@ -281,7 +281,7 @@ int i40e_ddp_load(struct net_device *netdev, const u8 *data, size_t size,
>  	if (!i40e_ddp_is_pkg_hdr_valid(netdev, pkg_hdr, size))
>  		return -EINVAL;
>  
> -	if (size < (sizeof(struct i40e_package_header) +
> +	if (size < (sizeof(struct i40e_package_header) + sizeof(u32) +
>  		    sizeof(struct i40e_metadata_segment) + sizeof(u32) * 2)) {
>  		netdev_err(netdev, "Invalid DDP recipe size.");
>  		return -EINVAL;
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
> index 388c3d36d96a..c3d5fe12059a 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_type.h
> +++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
> @@ -1456,7 +1456,7 @@ struct i40e_ddp_version {
>  struct i40e_package_header {
>  	struct i40e_ddp_version version;
>  	u32 segment_count;
> -	u32 segment_offset[1];
> +	u32 segment_offset[];
>  };
>  
>  /* Generic segment header */
> -- 
> 2.34.1
> 
>
Pucha, HimasekharX Reddy Aug. 10, 2023, 10:04 a.m. UTC | #2
> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Gustavo A. R. Silva
> Sent: Wednesday, August 2, 2023 10:36 AM
> To: Brandeburg, Jesse <jesse.brandeburg@intel.com>; Nguyen, Anthony L <anthony.l.nguyen@intel.com>; David S. Miller <davem@davemloft.net>; Eric Dumazet <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo Abeni <pabeni@redhat.com>
> Cc: linux-hardening@vger.kernel.org; netdev@vger.kernel.org; intel-wired-lan@lists.osuosl.org; linux-kernel@vger.kernel.org; Gustavo A. R. Silva <gustavoars@kernel.org>
> Subject: [Intel-wired-lan] [PATCH 1/4][next] i40e: Replace one-element array with flex-array member in struct i40e_package_header
>
> One-element and zero-length arrays are deprecated. So, replace one-element array in struct i40e_package_header with flexible-array member.
> 
> The `+ sizeof(u32)` adjustments ensure that there are no differences in binary output.
>
> Link: https://github.com/KSPP/linux/issues/335
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_ddp.c  | 4 ++--  drivers/net/ethernet/intel/i40e/i40e_type.h | 2 +-
> 2 files changed, 3 insertions(+), 3 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ddp.c b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
index 7e8183762fd9..0db6f5e3cfcc 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ddp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
@@ -220,7 +220,7 @@  static bool i40e_ddp_is_pkg_hdr_valid(struct net_device *netdev,
 		netdev_err(netdev, "Invalid DDP profile - size is bigger than 4G");
 		return false;
 	}
-	if (size < (sizeof(struct i40e_package_header) +
+	if (size < (sizeof(struct i40e_package_header) + sizeof(u32) +
 		sizeof(struct i40e_metadata_segment) + sizeof(u32) * 2)) {
 		netdev_err(netdev, "Invalid DDP profile - size is too small.");
 		return false;
@@ -281,7 +281,7 @@  int i40e_ddp_load(struct net_device *netdev, const u8 *data, size_t size,
 	if (!i40e_ddp_is_pkg_hdr_valid(netdev, pkg_hdr, size))
 		return -EINVAL;
 
-	if (size < (sizeof(struct i40e_package_header) +
+	if (size < (sizeof(struct i40e_package_header) + sizeof(u32) +
 		    sizeof(struct i40e_metadata_segment) + sizeof(u32) * 2)) {
 		netdev_err(netdev, "Invalid DDP recipe size.");
 		return -EINVAL;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h
index 388c3d36d96a..c3d5fe12059a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_type.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_type.h
@@ -1456,7 +1456,7 @@  struct i40e_ddp_version {
 struct i40e_package_header {
 	struct i40e_ddp_version version;
 	u32 segment_count;
-	u32 segment_offset[1];
+	u32 segment_offset[];
 };
 
 /* Generic segment header */