RE: [Intel-wired-lan] [PATCH][next] ixgbe: Fix out-bounds warning in ixgbe_host_interface_command()

["Switzer, David" <david.switzer@intel.com>]

>-----Original Message-----
>From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
>Gustavo A. R. Silva
>Sent: Tuesday, April 13, 2021 12:04 PM
>To: Brandeburg, Jesse <jesse.brandeburg@intel.com>; Nguyen, Anthony L
><anthony.l.nguyen@intel.com>; David S. Miller <davem@davemloft.net>; Jakub
>Kicinski <kuba@kernel.org>
>Cc: Kees Cook <keescook@chromium.org>; netdev@vger.kernel.org; linux-
>kernel@vger.kernel.org; Gustavo A. R. Silva <gustavoars@kernel.org>; intel-
>wired-lan@lists.osuosl.org; linux-hardening@vger.kernel.org
>Subject: [Intel-wired-lan] [PATCH][next] ixgbe: Fix out-bounds warning in
>ixgbe_host_interface_command()
>
>Replace union with a couple of pointers in order to fix the following out-of-
>bounds warning:
>
>  CC [M]  drivers/net/ethernet/intel/ixgbe/ixgbe_common.o
>drivers/net/ethernet/intel/ixgbe/ixgbe_common.c: In function
>‘ixgbe_host_interface_command’:
>drivers/net/ethernet/intel/ixgbe/ixgbe_common.c:3729:13: warning: array
>subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-
>bounds]
> 3729 |   bp->u32arr[bi] = IXGBE_READ_REG_ARRAY(hw, IXGBE_FLEX_MNG, bi);
>      |   ~~~~~~~~~~^~~~
>drivers/net/ethernet/intel/ixgbe/ixgbe_common.c:3682:7: note: while
>referencing ‘u32arr’
> 3682 |   u32 u32arr[1];
>      |       ^~~~~~
>
>This helps with the ongoing efforts to globally enable -Warray-bounds.
>
>Link: https://github.com/KSPP/linux/issues/109
>Co-developed-by: Kees Cook <keescook@chromium.org>
>Signed-off-by: Kees Cook <keescook@chromium.org>
>Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 16 +++++++---------
> 1 file changed, 7 insertions(+), 9 deletions(-)
>
Tested-by: Dave Switzer <david.switzer@intel.com>