File transfig-03ea4578.patch of Package transfig.8598

commit 03ea4578258d2d9ca1ceb080e469ad261db39ef0
Author: Thomas Loimer <thomas.loimer@tuwien.ac.at>
Date:   Fri Jul 26 23:25:50 2019 +0200

    Allow circle arrowheads when mag >= 42, ticket #52
    
    Circle and half-circle arrowheads would be drawn with 40 + mag/4 points by
    calc_arrow() in bound.c. However, the point arrays passed to calc_arrow()
    would only contain 50 points. With a magnification >= 42, a buffer overrun
    would occur. Simply use 40 points, independent of magnification.

---
 fig2dev/bound.c   |    6 +++---
 fig2dev/read1_3.c |   14 ++++++++------
 2 files changed, 11 insertions(+), 9 deletions(-)

--- fig2dev/bound.c
+++ fig2dev/bound.c	2019-08-15 07:38:07.518523525 +0000
@@ -888,7 +888,7 @@ calc_arrow(x1, y1, x2, y2, linethick, ar
 	/*
 	 * CIRCLE and HALF-CIRCLE arrowheads
 	 *
-	 * We approximate circles with (40+zoom)/4 points
+	 * We approximate circles with 40 points
 	 */
 
 	/* use original dx, dy to get starting angle */
@@ -907,8 +907,8 @@ calc_arrow(x1, y1, x2, y2, linethick, ar
 	radius = len/2.0;
 	fix_x = xs + (dx / (double) 2.0);
 	fix_y = ys + (dy / (double) 2.0);
-	/* choose number of points for circle - 40+mag/4 points */
-	np = round(mag/4.0) + 40;
+	/* choose number of points for circle */
+	*npoints = np = 40;
 
 	if (type == 5) {
 	    /* full circle */
--- fig2dev/read1_3.c
+++ fig2dev/read1_3.c	2019-08-15 07:40:27.699920660 +0000
@@ -206,13 +206,14 @@ FILE	*fp;
 		&com->secorner.x, &com->secorner.y);
 	if (n != 4) {
 	    put_msg("Incorrect compound object format");
+	    free(com);
 	    return(NULL);
 	    }
 	while (fscanf(fp, "%d", &object) == 1) {
 	    switch (object) {
 		case O_POLYLINE :
 		    if ((l = read_lineobject(fp)) == NULL) { 
-			free_line(&l);
+			free_compound(&com);
 			return(NULL);
 			}
 		    if (ll)
@@ -222,7 +223,7 @@ FILE	*fp;
 		    break;
 		case O_SPLINE :
 		    if ((s = read_splineobject(fp)) == NULL) { 
-			free_spline(&s);
+			free_compound(&com);
 			return(NULL);
 			}
 		    if (ls)
@@ -232,7 +233,7 @@ FILE	*fp;
 		    break;
 		case O_ELLIPSE :
 		    if ((e = read_ellipseobject(fp)) == NULL) { 
-			free_ellipse(&e);
+			free_compound(&com);
 			return(NULL);
 			}
 		    if (le)
@@ -242,7 +243,7 @@ FILE	*fp;
 		    break;
 		case O_ARC :
 		    if ((a = read_arcobject(fp)) == NULL) { 
-			free_arc(&a);
+			free_compound(&com);
 			return(NULL);
 			}
 		    if (la)
@@ -252,7 +253,7 @@ FILE	*fp;
 		    break;
 		case O_TEXT :
 		    if ((t = read_textobject(fp)) == NULL) { 
-			free_text(&t);
+			free_compound(&com);
 			return(NULL);
 			}
 		    if (lt)
@@ -262,7 +263,7 @@ FILE	*fp;
 		    break;
 		case O_COMPOUND :
 		    if ((c = read_compoundobject(fp)) == NULL) { 
-			free_compound(&c);
+			free_compound(&com);
 			return(NULL);
 			}
 		    if (lc)
@@ -278,6 +279,7 @@ FILE	*fp;
 	    return(com);
 	else {
 	    put_msg("Format error: %s", strerror(errno));
+	    free_compound(&com);
 	    return(NULL);
 	    }
 	}