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[RHEL7,qemu-kvm,1/3] Fix net.c warning on GCC 11

Message ID 25f6c760c09c2238ad9bdaab97e4ae13bf5af339.1610364304.git.mrezanin@redhat.com (mailing list archive)
State New, archived
Headers show
Series Fixing several GCC 11 warnings | expand

Commit Message

Miroslav Rezanina Jan. 11, 2021, 11:30 a.m. UTC 
From: Miroslav Rezanina <mrezanin@redhat.com>

When building qemu with GCC 11, compiling eth.c file produce following warning:

   warning: array subscript 'struct ip6_ext_hdr_routing[0]' is partly outside array bounds of 'struct ip6_ext_hdr[1]' [-Warray-bounds]

This caused by retyping from ip6_ext_hdr to ip6_ext_hdr_routing that has more
attributes.

As this usage is expected, suppress the warning temporarily through the function
using this retyping.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 net/eth.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/net/eth.c b/net/eth.c
index 1e0821c5f8..b9bdd0435c 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -405,6 +405,8 @@  _eth_get_rss_ex_dst_addr(const struct iovec *pkt, int pkt_frags,
                         struct ip6_ext_hdr *ext_hdr,
                         struct in6_address *dst_addr)
 {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
     struct ip6_ext_hdr_routing *rthdr = (struct ip6_ext_hdr_routing *) ext_hdr;
 
     if ((rthdr->rtype == 2) &&
@@ -426,6 +428,7 @@  _eth_get_rss_ex_dst_addr(const struct iovec *pkt, int pkt_frags,
     }
 
     return false;
+#pragma GCC diagnostic pop
 }
 
 static bool