https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202142
Bug ID: 202142
Summary: Uninitialized variable usage in error path in
_dns_getaddrinfo()
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: misc
Assignee: freebsd-bugs@FreeBSD.org
Reporter: se...@cosemica.com
The calls to RES_SET_H_ERRNO() macro on error paths wind up
dereferencing an uninitialized res:
Index: net/getaddrinfo.c
===================================================================
--- net/getaddrinfo.c (revision 286381)
+++ net/getaddrinfo.c (working copy)
@@ -2154,6 +2154,8 @@
memset(&sentinel, 0, sizeof(sentinel));
cur = &sentinel;
+ res = __res_state();
+
buf = malloc(sizeof(*buf));
if (!buf) {
RES_SET_H_ERRNO(res, NETDB_INTERNAL);
@@ -2200,7 +2202,6 @@
return NS_UNAVAIL;
}
- res = __res_state();
if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
RES_SET_H_ERRNO(res, NETDB_INTERNAL);
free(buf);
--
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