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-rw-r--r--inet/rcmd.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/inet/rcmd.c b/inet/rcmd.c
index 4737e6e315..42871f7950 100644
--- a/inet/rcmd.c
+++ b/inet/rcmd.c
@@ -464,7 +464,14 @@ rresvport_af(alport, family)
#endif
ss.ss_family = family;
- for (;;) {
+ /* Ignore invalid values. */
+ if (*alport < IPPORT_RESERVED / 2)
+ *alport = IPPORT_RESERVED / 2;
+ else if (*alport >= IPPORT_RESERVED)
+ *alport = IPPORT_RESERVED - 1;
+
+ int start = *alport;
+ do {
*sport = htons((uint16_t) *alport);
if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
return s;
@@ -472,10 +479,9 @@ rresvport_af(alport, family)
(void)__close(s);
return -1;
}
- (*alport)--;
- if (*alport == IPPORT_RESERVED/2)
- break;
- }
+ if ((*alport)-- == IPPORT_RESERVED/2)
+ *alport = IPPORT_RESERVED - 1;
+ } while (*alport != start);
(void)__close(s);
__set_errno (EAGAIN);
return -1;