cachedb_redis docs: Add an FAQ section regarding CVE-2020-7105

modules/cachedb_redis/doc/cachedb_redis.xml

@@ -4,6 +4,7 @@
 
 
 <!ENTITY admin SYSTEM "cachedb_redis_admin.xml">
+<!ENTITY faq SYSTEM "cachedb_redis_faq.xml">
 <!ENTITY contrib SYSTEM "contributors.xml">
 
 <!-- Include general documentation entities -->
@@ -21,6 +22,7 @@
 
 	&admin;
 	&contrib;
+	&faq;
 
 	&docCopyrights;
 	<para>&copyright; 2011 &osipssol;</para>

modules/cachedb_redis/doc/cachedb_redis_faq.xml

@@ -0,0 +1,21 @@
+<!-- Module FAQ -->
+
+<chapter>
+	<title>&faqguide;</title>
+	<qandaset defaultlabel="number">
+	<qandaentry>
+		<question>
+		<para>My OpenSIPS is occasionally crashing in libhiredis, what to do?</para>
+		</question>
+		<answer>
+		<para>
+		Make sure you've upgraded the Redis "libhiredis" client library to at
+		least version 0.14.1.  There was at least one significant vulnerability
+		reported in library versions prior to that one (<ulink url="https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-7105">CVE-2020-7105</ulink>),
+		so upgrading to latest stable may very well fix the crash!
+		</para>
+		</answer>
+	</qandaentry>
+
+	</qandaset>
+</chapter>