1 files changed, 4 insertions, 0 deletions
diff --git a/qemu-edid.c b/qemu-edid.c
index 20c958d..92e1a66 100644
--- a/qemu-edid.c
+++ b/qemu-edid.c
@@ -92,6 +92,10 @@ int main(int argc, char *argv[])
                 fprintf(stderr, "not a number: %s\n", optarg);
                 exit(1);
             }
+            if (dpi == 0) {
+                fprintf(stderr, "cannot be zero: %s\n", optarg);
+                exit(1);
+            }
             break;
         case 'v':
             info.vendor = optarg;