Messages in this thread | | | Date | Fri, 6 Jan 2023 10:00:26 -0600 | From | "Gustavo A. R. Silva" <> | Subject | Re: [PATCH] net: ipv6: rpl_iptunnel: Replace 0-length arrays with flexible arrays |
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On Thu, Jan 05, 2023 at 02:15:37PM -0800, Kees Cook wrote: > Zero-length arrays are deprecated[1]. Replace struct ipv6_rpl_sr_hdr's > "segments" union of 0-length arrays with flexible arrays. Detected with > GCC 13, using -fstrict-flex-arrays=3: > > In function 'rpl_validate_srh', > inlined from 'rpl_build_state' at ../net/ipv6/rpl_iptunnel.c:96:7: > ../net/ipv6/rpl_iptunnel.c:60:28: warning: array subscript <unknown> is outside array bounds of 'struct in6_addr[0]' [-Warray-bounds=] > 60 | if (ipv6_addr_type(&srh->rpl_segaddr[srh->segments_left - 1]) & > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > In file included from ../include/net/rpl.h:12, > from ../net/ipv6/rpl_iptunnel.c:13: > ../include/uapi/linux/rpl.h: In function 'rpl_build_state': > ../include/uapi/linux/rpl.h:40:33: note: while referencing 'addr' > 40 | struct in6_addr addr[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: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> > Cc: David Ahern <dsahern@kernel.org> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> > Cc: netdev@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks! -- Gustavo
> --- > include/uapi/linux/rpl.h | 4 ++-- > net/ipv6/rpl_iptunnel.c | 2 +- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/include/uapi/linux/rpl.h b/include/uapi/linux/rpl.h > index 708adddf9f13..7c8970e5b84b 100644 > --- a/include/uapi/linux/rpl.h > +++ b/include/uapi/linux/rpl.h > @@ -37,8 +37,8 @@ struct ipv6_rpl_sr_hdr { > #endif > > union { > - struct in6_addr addr[0]; > - __u8 data[0]; > + __DECLARE_FLEX_ARRAY(struct in6_addr, addr); > + __DECLARE_FLEX_ARRAY(__u8, data); > } segments; > } __attribute__((packed)); > > diff --git a/net/ipv6/rpl_iptunnel.c b/net/ipv6/rpl_iptunnel.c > index ff691d9f4a04..b1c028df686e 100644 > --- a/net/ipv6/rpl_iptunnel.c > +++ b/net/ipv6/rpl_iptunnel.c > @@ -13,7 +13,7 @@ > #include <net/rpl.h> > > struct rpl_iptunnel_encap { > - struct ipv6_rpl_sr_hdr srh[0]; > + DECLARE_FLEX_ARRAY(struct ipv6_rpl_sr_hdr, srh); > }; > > struct rpl_lwt { > -- > 2.34.1 >
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