X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Fjtag%2Ftcl.c;fp=src%2Fjtag%2Ftcl.c;h=dd2be1e5ad3f58e06794d5440841d559704aaf16;hp=ceea19303c53e8debad0d8eee4473efbb9a24d31;hb=bb0ef230ca707252cbab93f1eb944b284a3c1e1d;hpb=98b808923fbcf806f71aa256684407051008ef03

diff --git a/src/jtag/tcl.c b/src/jtag/tcl.c
index ceea19303c..dd2be1e5ad 100644
--- a/src/jtag/tcl.c
+++ b/src/jtag/tcl.c
@@ -169,7 +169,10 @@ static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *args
 		return JIM_ERR;
 
 	num_fields = (argc-2)/2;
-	assert(num_fields > 0);
+	if (num_fields <= 0) {
+		Jim_SetResultString(interp, "drscan: no scan fields supplied", -1);
+		return JIM_ERR;
+	}
 	fields = malloc(sizeof(struct scan_field) * num_fields);
 	for (i = 2; i < argc; i += 2) {
 		long bits;