diff -Naurp pcp-4.3.2-orig/src/pcp/atop/atop.c pcp-4.3.2/src/pcp/atop/atop.c
--- pcp-4.3.2-orig/src/pcp/atop/atop.c	2019-03-14 08:01:57.000000000 +1100
+++ pcp-4.3.2/src/pcp/atop/atop.c	2020-02-19 12:43:05.073078137 +1100
@@ -632,14 +632,12 @@ engine(void)
 		*/
 		if (nprocexit > 0)
 		{
-			curpexit = malloc(nprocexit * sizeof(struct tstat));
+			curpexit = calloc(nprocexit, sizeof(struct tstat));
 
 			ptrverify(curpexit,
 			          "Malloc failed for %lu exited processes\n",
 			          nprocexit);
 
-			memset(curpexit, 0, nprocexit * sizeof(struct tstat));
-
 			nprocexit = acctphotoproc(curpexit, nprocexit);
 
 			/*
diff -Naurp pcp-4.3.2-orig/src/pcp/atop/deviate.c pcp-4.3.2/src/pcp/atop/deviate.c
--- pcp-4.3.2-orig/src/pcp/atop/deviate.c	2019-03-08 08:26:34.000000000 +1100
+++ pcp-4.3.2/src/pcp/atop/deviate.c	2020-02-19 12:43:05.076078101 +1100
@@ -84,7 +84,7 @@ deviattask(struct tstat    *curtpres, un
 	** create list for the sample deviations of all tasks
 	*/
  	devtstat->ntaskall = ntaskpres + nprocexit;
-	devtstat->taskall  = malloc(devtstat->ntaskall * sizeof(struct tstat));
+	devtstat->taskall  = calloc(devtstat->ntaskall, sizeof(struct tstat));
 
 	ptrverify(devtstat->taskall, "Malloc failed for %lu deviated tasks\n",
                                   devtstat->ntaskall);
@@ -371,9 +371,9 @@ deviattask(struct tstat    *curtpres, un
 	/*
 	** create and fill other pointer lists
 	*/
-	devtstat->procall    = malloc(devtstat->nprocall *
+	devtstat->procall    = calloc(devtstat->nprocall,
 						sizeof(struct tstat *));
-	devtstat->procactive = malloc(devtstat->nprocactive *
+	devtstat->procactive = calloc(devtstat->nprocactive,
 						sizeof(struct tstat *));
 
 	ptrverify(devtstat->procall, "Malloc failed for %d processes\n",
diff -Naurp pcp-4.3.2-orig/src/pcp/atop/photoproc.c pcp-4.3.2/src/pcp/atop/photoproc.c
--- pcp-4.3.2-orig/src/pcp/atop/photoproc.c	2019-01-24 10:23:34.000000000 +1100
+++ pcp-4.3.2/src/pcp/atop/photoproc.c	2020-02-19 12:43:05.076078101 +1100
@@ -166,8 +166,10 @@ photoproc(struct tstat **tasks, unsigned
 		fprintf(stderr, "%s: done %lu processes\n", pmGetProgname(), count);
 
 	pmFreeResult(result);
-	free(insts);
-	free(pids);
+	if (count > 0) {
+	    free(insts);
+	    free(pids);
+	}
 
 	return count;
 }
diff -Naurp pcp-4.3.2-orig/src/pcp/atop/showlinux.c pcp-4.3.2/src/pcp/atop/showlinux.c
--- pcp-4.3.2-orig/src/pcp/atop/showlinux.c	2019-01-24 10:24:56.000000000 +1100
+++ pcp-4.3.2/src/pcp/atop/showlinux.c	2020-02-19 12:43:05.077078090 +1100
@@ -654,19 +654,22 @@ totalcap(struct syscap *psc, struct ssta
 		struct tstat 	*curstat = *(proclist+i);
 		count_t		nett_wsz;
 
-		psc->availnet += curstat->net.tcpssz;
-		psc->availnet += curstat->net.tcprsz;
-		psc->availnet += curstat->net.udpssz;
-		psc->availnet += curstat->net.udprsz;
-
-		if (curstat->dsk.wsz > curstat->dsk.cwsz)
-			nett_wsz = curstat->dsk.wsz -
-			           curstat->dsk.cwsz;
-		else
-			nett_wsz = 0;
+		if (curstat)
+		{
+			psc->availnet += curstat->net.tcpssz;
+			psc->availnet += curstat->net.tcprsz;
+			psc->availnet += curstat->net.udpssz;
+			psc->availnet += curstat->net.udprsz;
+
+			if (curstat->dsk.wsz > curstat->dsk.cwsz)
+				nett_wsz = curstat->dsk.wsz -
+					   curstat->dsk.cwsz;
+			else
+				nett_wsz = 0;
 
-		psc->availdsk += curstat->dsk.rsz;
-		psc->availdsk += nett_wsz;
+			psc->availdsk += curstat->dsk.rsz;
+			psc->availdsk += nett_wsz;
+		}
 	}
 
 	for (psc->availgpumem=i=0; i < sstat->gpu.nrgpus; i++)
@@ -985,8 +988,11 @@ pricumproc(struct sstat *sstat, struct d
         {
 		struct tstat *curstat = *(devtstat->procactive+i);
 
-                extra.totut	+= curstat->cpu.utime;
-                extra.totst 	+= curstat->cpu.stime;
+		if (curstat)
+		{
+			extra.totut	+= curstat->cpu.utime;
+			extra.totst 	+= curstat->cpu.stime;
+		}
         }
 
         extra.nproc	= devtstat->nprocall;