resolv: Reset defdname before use in __res_vinit [BZ #19369]

Resetting defdname (default domain name) before use in __res_vinit ensures that the default domain name is correctly set to a default value when it is not set by the LOCALDOMAIN environment variable or the "domain" or "search" parameters in resolv.conf Tested using the steps from: https://sourceware.org/bugzilla/show_bug.cgi?id=19369
git-mirror · Dec 29, 2015 · b674b82 · b674b82
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,8 @@
+2015-12-29  Rob Wu  <rob@robwu.nl>
+
+	[BZ #19369]
+	* resolv/res_init.c (__res_vinit): Reset defdname before use.
+
 2015-12-29  John David Anglin  <danglin@gcc.gnu.org>
 
 	[BZ #19270]

diff --git a/resolv/res_init.c b/resolv/res_init.c
@@ -176,6 +176,7 @@ __res_vinit(res_state statp, int preinit) {
 	}
 
 	statp->nscount = 0;
+	statp->defdname[0] = '\0';
 	statp->ndots = 1;
 	statp->pfcode = 0;
 	statp->_vcsock = -1;