[sr-dev] git:4.3:d2600807: core: dns cache - test for null pointers before debug checks after removing from list

[Daniel-Constantin Mierla]

Module: kamailio
Branch: 4.3
Commit: d260080724b8f9ec0a3c55b3cee3ce34205b814c
URL: https://github.com/kamailio/kamailio/commit/d260080724b8f9ec0a3c55b3cee3ce34205b814c

Author: Daniel-Constantin Mierla <miconda at gmail.com>
Committer: Daniel-Constantin Mierla <miconda at gmail.com>
Date: 2015-11-16T12:00:33+01:00

core: dns cache - test for null pointers before debug checks after removing from list

- next/prev are set to null after remove from list by commit
  0fbcca38574139f1cd8ba7506ee5e204be5f2da7

(cherry picked from commit 70699ae8b9159c18bdd73c3092ccb19691edf0fd)

---

Modified: dns_cache.c

---

Diff:  https://github.com/kamailio/kamailio/commit/d260080724b8f9ec0a3c55b3cee3ce34205b814c.diff
Patch: https://github.com/kamailio/kamailio/commit/d260080724b8f9ec0a3c55b3cee3ce34205b814c.patch

---

diff --git a/dns_cache.c b/dns_cache.c
index cb2d5be..21b780e 100644
--- a/dns_cache.c
+++ b/dns_cache.c
@@ -459,15 +459,15 @@ int init_dns_cache_stats(int iproc_num)
 
 #define debug_lu_lst( txt, l) \
 	do{ \
-		if (check_lu_lst((l))){  \
+		if ((l) && check_lu_lst((l))){  \
 			dbg_lu_lst(txt  " crt:", (l)); \
 			abort(); \
 		} \
-		if (check_lu_lst((l)->next)){ \
+		if (((l)->next) && check_lu_lst((l)->next)){ \
 			dbg_lu_lst(txt  " next:",  (l)); \
 			abort(); \
 		} \
-		if (check_lu_lst((l)->prev)){ \
+		if (((l)->prev) && check_lu_lst((l)->prev)){ \
 			dbg_lu_lst(txt  " prev:", (l)); \
 			abort(); \
 		} \