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vnc: avoid underflow when accessing user-provided address 

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 3f9c41c5df)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Paolo Bonzini 2023-03-30 14:23:40 +02:00 committed by Michael Tokarev
parent 161e1f22b8
commit bfc532703f
1 changed files with 1 additions and 1 deletions
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2
ui/vnc.c
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@ -3765,7 +3765,7 @@ static int vnc_display_get_address(const char *addrstr,
addr->type = SOCKET_ADDRESS_TYPE_INET;
inet = &addr->u.inet;
if (addrstr[0] == '[' && addrstr[hostlen - 1] == ']') {
if (hostlen && addrstr[0] == '[' && addrstr[hostlen - 1] == ']') {
inet->host = g_strndup(addrstr + 1, hostlen - 2);
} else {
inet->host = g_strndup(addrstr, hostlen);