[sr-dev] git:5.5:5dbf99eb: ndb_redis: fix SIGSEGV in redisc_check_auth

[Daniel-Constantin Mierla]

Module: kamailio
Branch: 5.5
Commit: 5dbf99eb03aba76905aa926a55aedd3caa0fcd05
URL: https://github.com/kamailio/kamailio/commit/5dbf99eb03aba76905aa926a55aedd3caa0fcd05

Author: Dennis Yurasov <dennis-y at yandex-team.ru>
Committer: Daniel-Constantin Mierla <miconda at gmail.com>
Date: 2021-09-09T10:30:30+02:00

ndb_redis: fix SIGSEGV in redisc_check_auth

- Added the check for NULL pointer. When TCP session to redis reset,
  redisCommand function can return NULL pointer.

(cherry picked from commit c32a0be89cc92a0649277774d1e7aebf349b8b49)

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Modified: src/modules/ndb_redis/redis_client.c

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Diff:  https://github.com/kamailio/kamailio/commit/5dbf99eb03aba76905aa926a55aedd3caa0fcd05.diff
Patch: https://github.com/kamailio/kamailio/commit/5dbf99eb03aba76905aa926a55aedd3caa0fcd05.patch

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diff --git a/src/modules/ndb_redis/redis_client.c b/src/modules/ndb_redis/redis_client.c
index befb69ab79..bb6adc20b1 100644
--- a/src/modules/ndb_redis/redis_client.c
+++ b/src/modules/ndb_redis/redis_client.c
@@ -1269,6 +1269,10 @@ int redisc_check_auth(redisc_server_t *rsrv, char *pass)
 	int retval = 0;
 
 	reply = redisCommand(rsrv->ctxRedis, "AUTH %s", pass);
+	if(!reply) {
+		LM_ERR("Redis authentication error\n");
+		return -1;
+	}
 	if (reply->type == REDIS_REPLY_ERROR) {
 		LM_ERR("Redis authentication error\n");
 		retval = -1;