If hostlen is zero, there is a possibility that addrstr[hostlen - 1]
underflows and, if a closing bracked is there, hostlen - 2 is passed
to g_strndup() on the next line. If websocket==false then
addrstr[0] would be a colon, but if websocket==true this could in
principle happen.
Fix it by checking hostlen.
Reported by Coverity.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 3f9c41c5df9617510d8533cf6588172efb3df34b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
bfc532703f