bugfix [#22990] Crash rendering joined curves

- dont render invalid material indicies (like mesh faces)
- clamp the material index values when joining, TODO: merge material lists properly.

2 files changed, 5 insertions, 1 deletions

diff --git a/source/blender/editors/curve/editcurve.c b/source/blender/editors/curve/editcurve.c
index 659ee7b9cea..c33565cee4b 100644
--- a/source/blender/editors/curve/editcurve.c
+++ b/source/blender/editors/curve/editcurve.c
@@ -4843,6 +4843,7 @@ int join_curve_exec(bContext *C, wmOperator *op)
 					nu= cu->nurb.first;
 					while(nu) {
 						newnu= duplicateNurb(nu);
+						CLAMP(newnu->mat_nr, 0, ob->totcol-1); /* TODO, merge material lists */
 						BLI_addtail(&tempbase, newnu);
 						
 						if( (bezt= newnu->bezt) ) {
diff --git a/source/blender/render/intern/source/convertblender.c b/source/blender/render/intern/source/convertblender.c
index b2f526f0297..c5d69e69586 100644
--- a/source/blender/render/intern/source/convertblender.c
+++ b/source/blender/render/intern/source/convertblender.c
@@ -2848,7 +2848,10 @@ static void init_render_curve(Render *re, ObjectRen *obr, int timeoffset)
 		}
 
 		while(dl) {
-			if(dl->type==DL_INDEX3) {
+			if(dl->col > ob->totcol) {
+				/* pass */
+			}
+			else if(dl->type==DL_INDEX3) {
 				int *index;
 
 				startvert= obr->totvert;