File 0009-Fix-null-dereference-qualifying-short-host... of Package krb5

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File 0009-Fix-null-dereference-qualifying-short-hostnames.patch of Package krb5 (Revision 2dec0466025beef1d7b49bb613348da5)

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From 96d0ee0760a1c7cf735d04fbddf095a4c01ef190 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Tue, 3 Mar 2020 12:27:02 -0500
Subject: [PATCH] Fix null dereference qualifying short hostnames

Fix the dnsglue.c PRIMARY_DOMAIN macro not to call strdup() with a
null pointer if no DNS search path is configured.

ticket: 8881
tags: pullup
target_version: 1.18-next

(cherry picked from commit cd82bf377e7fad2409c76bf8b241920692f34fda)
---
 src/lib/krb5/os/dnsglue.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/lib/krb5/os/dnsglue.c b/src/lib/krb5/os/dnsglue.c
index e35ca9d76..0cd213fdd 100644
--- a/src/lib/krb5/os/dnsglue.c
+++ b/src/lib/krb5/os/dnsglue.c
@@ -91,7 +91,7 @@ static int initparse(struct krb5int_dns_state *);
 #define DECLARE_HANDLE(h) struct __res_state h
 #define INIT_HANDLE(h) (memset(&h, 0, sizeof(h)), res_ninit(&h) == 0)
 #define SEARCH(h, n, c, t, a, l) res_nsearch(&h, n, c, t, a, l)
-#define PRIMARY_DOMAIN(h) strdup(h.dnsrch[0])
+#define PRIMARY_DOMAIN(h) ((h.dnsrch[0] == NULL) ? NULL : strdup(h.dnsrch[0]))
 #if HAVE_RES_NDESTROY
 #define DESTROY_HANDLE(h) res_ndestroy(&h)
 #else
@@ -104,7 +104,8 @@ static int initparse(struct krb5int_dns_state *);
 #define DECLARE_HANDLE(h)
 #define INIT_HANDLE(h) (res_init() == 0)
 #define SEARCH(h, n, c, t, a, l) res_search(n, c, t, a, l)
-#define PRIMARY_DOMAIN(h) strdup(_res.defdname)
+#define PRIMARY_DOMAIN(h) \
+    ((_res.defdname == NULL) ? NULL : strdup(_res.defdname))
 #define DESTROY_HANDLE(h)
 
 #endif
-- 
2.25.1

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File 0009-Fix-null-dereference-qualifying-short-hostnames.patch of Package krb5 (Revision 2dec0466025beef1d7b49bb613348da5)

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