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SubjectRe: [PATCH v3] ethtool: Replace 0-length array with flexible array
On Fri, Jan 06, 2023 at 02:47:35PM +0900, Vincent MAILHOL wrote:
> On Fri. 6 Jan 2023 at 13:28, Kees Cook <keescook@chromium.org> wrote:
> > Zero-length arrays are deprecated[1]. Replace struct ethtool_rxnfc's
> > "rule_locs" 0-length array with a flexible array. Detected with GCC 13,
> > using -fstrict-flex-arrays=3:
> >
> > net/ethtool/common.c: In function 'ethtool_get_max_rxnfc_channel':
> > net/ethtool/common.c:558:55: warning: array subscript i is outside array bounds of '__u32[0]' {aka 'unsigned int[]'} [-Warray-bounds=]
> > 558 | .fs.location = info->rule_locs[i],
> > | ~~~~~~~~~~~~~~~^~~
> > In file included from include/linux/ethtool.h:19,
> > from include/uapi/linux/ethtool_netlink.h:12,
> > from include/linux/ethtool_netlink.h:6,
> > from net/ethtool/common.c:3:
> > include/uapi/linux/ethtool.h:1186:41: note: while referencing
> > 'rule_locs'
> > 1186 | __u32 rule_locs[0];
> > | ^~~~~~~~~
> >
> > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> >
> > Cc: "David S. Miller" <davem@davemloft.net>
> > Cc: Jakub Kicinski <kuba@kernel.org>
> > Cc: Andrew Lunn <andrew@lunn.ch>
> > Cc: kernel test robot <lkp@intel.com>
> > Cc: Oleksij Rempel <linux@rempel-privat.de>
> > Cc: Sean Anderson <sean.anderson@seco.com>
> > Cc: Alexandru Tachici <alexandru.tachici@analog.com>
> > Cc: Amit Cohen <amcohen@nvidia.com>
> > Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
> > Cc: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > Cc: netdev@vger.kernel.org
> > Signed-off-by: Kees Cook <keescook@chromium.org>
> > ---
> > v3: don't use helper (vincent)
>
> v1: https://lore.kernel.org/all/20230105214126.never.757-kees@kernel.org
> ^^^^^
> > v2: https://lore.kernel.org/lkml/20230105233420.gonna.036-kees@kernel.org
> ^^^^^
> v3: https://lore.kernel.org/netdev/20230106042844.give.885-kees@kernel.org
> ^^^^
>
> Seriously... :)

Hurray! Someone noticed and it's not even April yet. :) *celebrate*

-Kees

--
Kees Cook

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