If we iterate over the full port range without successfully binding+listening
on the socket, we'll try the next address, whereupon we overwrite the slisten
file descriptor variable without closing it.
Rather than having two places where we open + close socket FDs on different
iterations of nested for loops, re-arrange the code to always open+close
within the same loop iteration.
Signed-off-by: Daniel P. Berrange <berra...@redhat.com>
---
util/qemu-sockets.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index b47fb45885..a319338cca 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -207,7 +207,7 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
int rc, port_min, port_max, p;
- int slisten = 0;
+ int slisten = -1;
int saved_errno = 0;
bool socket_created = false;
Error *err = NULL;
@@ -267,16 +267,28 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
- slisten = create_fast_reuse_socket(e);
- if (slisten < 0) {
- continue;
- }
-
socket_created = true;
port_min = inet_getport(e);
port_max = saddr->has_to ? saddr->to + port_offset : port_min;
for (p = port_min; p <= port_max; p++) {
inet_setport(e, p);
+
+ slisten = create_fast_reuse_socket(e);
+ if (slisten < 0) {
+ /* First time we expect we might fail to create the socket
+ * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
+ * Later iterations should always succeeed if first iteration
+ * worked though, so treat that as fatal.
+ */
+ if (p == port_min) {
+ continue;
+ } else {
+ error_setg_errno(errp, errno,
+ "Failed to recreate failed listening
socket");
+ goto listen_failed;
+ }
+ }
+
rc = try_bind(slisten, saddr, e);
if (rc) {
if (errno == EADDRINUSE) {
@@ -299,12 +311,7 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
* socket to allow bind attempts for subsequent ports:
*/
closesocket(slisten);
- slisten = create_fast_reuse_socket(e);
- if (slisten < 0) {
- error_setg_errno(errp, errno,
- "Failed to recreate failed listening socket");
- goto listen_failed;
- }
+ slisten = -1;
}
}
error_setg_errno(errp, errno,
--
2.13.6
