MFH: r516110

databases/rrdtool: Fix segfault

Add upstream patch to databases/rrdtool to fix segfault when trying to
calculate median of all-NaN values

PR:		241477
Submitted by:	amdmi3

Approved by:	ports-secteam (joenum)

databases/rrdtool/Makefile

@@ -3,6 +3,7 @@
 
 PORTNAME=	rrdtool
 PORTVERSION=	1.7.2
+PORTREVISION=	1
 CATEGORIES=	databases graphics
 MASTER_SITES=	http://oss.oetiker.ch/rrdtool/pub/
 

databases/rrdtool/files/patch-src_rrd__rpncalc.c

@@ -0,0 +1,29 @@
+Fix UB when calculating median of all-NaN values
+
+Corresponds to upstream commit 1d700bf
+
+https://github.com/oetiker/rrdtool-1.x/commit/1d700bf3ba13a75b91047e6e979231abd755892b
+
+--- src/rrd_rpncalc.c.orig	2019-05-27 18:48:09 UTC
++++ src/rrd_rpncalc.c
+@@ -1197,15 +1197,16 @@ short rpn_calc(
+                     }
+                 }
+ 
++				/* when goodvals and badvals meet, they might have met on a
++				 * NAN, which wouldn't decrease final_elements. so, check
++				 * that now. */
++				if (isnan(*goodvals)) --final_elements;
++
+                 stptr -= elements;
+                 if (!final_elements) {
+                     /* no non-NAN elements; push NAN */
+                     rpnstack->s[++stptr] = DNAN;
+                 } else {
+-                    /* when goodvals and badvals meet, they might have met on a
+-                     * NAN, which wouldn't decrease final_elements. so, check
+-                     * that now. */
+-                    if (isnan(*goodvals)) --final_elements;
+                     /* and finally, take the median of the remaining non-NAN
+                      * elements. */
+                     qsort(element_ptr, final_elements, sizeof(double),