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net: ipv4: Avoid bounds check warning

Fix the following build warning when CONFIG_IPV6 is not set:

In function ‘fortify_memcpy_chk’,
inlined from ‘tcp_md5_do_add’ at net/ipv4/tcp_ipv4.c:1210:2:
./include/linux/fortify-string.h:328:4: error: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
328 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: huhai <huhai@kylinos.cn>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220526101213.2392980-1-zhanggenjian@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

huhai and committed by
Jakub Kicinski 3a2cd89b 90343f57

+2 -2
+2 -2
net/ipv4/tcp_ipv4.c
··· 1207 1207 key->l3index = l3index; 1208 1208 key->flags = flags; 1209 1209 memcpy(&key->addr, addr, 1210 - (family == AF_INET6) ? sizeof(struct in6_addr) : 1211 - sizeof(struct in_addr)); 1210 + (IS_ENABLED(CONFIG_IPV6) && family == AF_INET6) ? sizeof(struct in6_addr) : 1211 + sizeof(struct in_addr)); 1212 1212 hlist_add_head_rcu(&key->node, &md5sig->head); 1213 1213 return 0; 1214 1214 }