lib: Avoid declaring zero-length VLAs in various messaging functions
In messaging_rec_create(), messaging_recv_cb() and
messaging_dispatch_rec(), variable length arrays of file descriptors are
declared using an incoming num_fds parameter.
However, there are several scenarios where num_fds can be zero, and
declaring a zero-length VLA is undefined behavior. This can lead to
segmentation faults and/or other crashes when compiling with recent
versions of clang at high optimization levels.
To avoid ever using zero as the length for these declarations, use
MAX(1, length) instead.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14605
Signed-off-by: Dimitry Andric <dimitry@andric.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Jan 4 10:50:07 UTC 2021 on sn-devel-184