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inet_listen_opts: add error checking 

Don't use atoi() function which doesn't detect errors, switch to
strtol and error out on failures.  Also add a range check while
being at it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-12-11 12:58:41 +01:00
parent 2a2c4830c0
commit 8bc8912796
1 changed files with 13 additions and 2 deletions
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15
util/qemu-sockets.c
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@ -131,8 +131,19 @@ int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
ai.ai_family = PF_INET6;
/* lookup */
if (port_offset)
snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
if (port_offset) {
unsigned long long baseport;
if (parse_uint_full(port, &baseport, 10) < 0) {
error_setg(errp, "can't convert to a number: %s", port);
return -1;
}
if (baseport > 65535 ||
baseport + port_offset > 65535) {
error_setg(errp, "port %s out of range", port);
return -1;
}
snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
}
rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
if (rc != 0) {
error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,