This fixes compilation with -Wstrict-overflow=2.
with CFLAGS="-O3 -Werror=strict-overflow -Wstrict-overflow=2"
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10) gives:
addr_families.c: In function ‘krb5_sockaddr2address’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:851:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_sockaddr2address (krb5_context context,
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_sockaddr2port’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:879:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_sockaddr2port (krb5_context context,
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_addr2sockaddr’:
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:914:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_addr2sockaddr (krb5_context context,
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_max_sockaddr_size’:
addr_families.c:955:2: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for(a = at; a < at + num_addrs; ++a)
^
addr_families.c:950:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_max_sockaddr_size (void)
^
addr_families.c:955:2: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for(a = at; a < at + num_addrs; ++a)
^
addr_families.c:955:2: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c:955:2: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_sockaddr_uninteresting’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:974:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_sockaddr_uninteresting(const struct sockaddr *sa)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_sockaddr_is_loopback’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:983:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_sockaddr_is_loopback(const struct sockaddr *sa)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_h_addr2sockaddr’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1011:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_h_addr2sockaddr (krb5_context context,
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_h_addr2addr’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1042:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_h_addr2addr (krb5_context context,
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_anyaddr’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1073:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_anyaddr (krb5_context context,
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_print_address’:
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1108:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_print_address (const krb5_address *addr,
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_address_order’:
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1238:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_address_order(krb5_context context,
^
addr_families.c:1238:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c: In function ‘krb5_free_address’:
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1333:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_free_address(krb5_context context,
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_copy_address’:
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1383:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_copy_address(krb5_context context,
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:820:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
addr_families.c: In function ‘krb5_address_prefixlen_boundary’:
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:1537:1: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
krb5_address_prefixlen_boundary(krb5_context context,
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
for (a = at; a < at + num_addrs; ++a)
^
addr_families.c:831:5: warning: assuming pointer wraparound does not occur when comparing P +- C1 with P +- C2 [-Wstrict-overflow]
CC libkrb5_la-config_file.lo
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
(Similar to Samba commit aa17db1f4061920512396032fcd3c7c8a4a8f38f)
On any OS with a properly implemented getaddrinfo() this change is a
no-op. Passing NULL for the hint is supposed to be the same as an
addrinfo structure with all fields set to 0. There is no need to set
ai_family to AF_UNSPEC because that value is already 0.
GNU libc doesn't follow standard behaviour. Quoting from
http://man7.org/linux/man-pages/man3/getaddrinfo.3.html :
"Specifying hints as NULL is equivalent to setting ai_socktype and
ai_protocol to 0; ai_family to AF_UNSPEC; and ai_flags to
(AI_V4MAPPED | AI_ADDRCONFIG). (POSIX specifies different defaults for
ai_flags; see NOTES.)"
The NOTES section says:
"According to POSIX.1-2001, specifying hints as NULL should cause
ai_flags to be assumed as 0. The GNU C library instead assumes a value
of (AI_V4MAPPED | AI_ADDRCONFIG) for this case, since this value is
considered an improvement on the specification."
The patch makes sure that krb5_parse_address works consistently on both
GNU libc and systems that follow POSIX.1-2001 to the letter. Some
incorrect Fedora 17 patches managed to break IPv6 connectivity and were
later backed out (see discussion at https://bugzilla.redhat.com/808147).
This patch resolves the incompatibility.
Signed-off-by: Ken Dreyer <ktdreyer@ktdreyer.com>
We turn on a few extra warnings and fix the fallout that occurs
when building with --enable-developer. Note that we get different
warnings on different machines and so this will be a work in
progress. So far, we have built on NetBSD/amd64 5.99.64 (which
uses gcc 4.5.3) and Ubuntu 10.04.3 LTS (which uses gcc 4.4.3).
Notably, we fixed
1. a lot of missing structure initialisers,
2. unchecked return values for functions that glibc
marks as __attribute__((warn-unused-result)),
3. made minor modifications to slc and asn1_compile
which can generate code which generates warnings,
and
4. a few stragglers here and there.
We turned off the extended warnings for many programs in appl/ as
they are nearing the end of their useful lifetime, e.g. rsh, rcp,
popper, ftp and telnet.
Interestingly, glibc's strncmp() macro needed to be worked around
whereas the function calls did not.
We have not yet tried this on 32 bit platforms, so there will be
a few more warnings when we do.
most of these warnings are not problems because of ample
use of abort() calls. However, the large number of warnings
makes it difficult to identify real problems. Initialize
the variables to shut up the compilers.
Change-Id: I8477c11b17c7b6a7d9074c721fdd2d7303b186a8
instead of int and that acts as an in-out parameter (indicating the
maximum length of the sockaddr to be written)
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@10866 ec53bebd-3082-4978-b11e-865c3cabbd6b
