qemu-edid: Restrict input parameter -d to avoid division by zero

A zero value for dpi will lead to a division by zero in qemu_edid_dpi_to_mm(). Tested by runnig qemu-edid -dX, X = 0, 100. Resolves: qemu-project/qemu#1249 Suggested-by: Thomas Huth <[email protected]> Signed-off-by: Sebastian Mitterle <[email protected]> Message-Id: <[email protected]> Signed-off-by: Gerd Hoffmann <[email protected]>
antangelo · Oct 12, 2022 · 82a628f · 82a628f
1 parent 8af5f82
commit 82a628f
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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;