raster-interpreter.c: Fix crash in 'scan_ps()' found by fuzzer

Fuzzer using _cupsRasterExecPS() found a way how to pass NULL into scan_ps(), causing crash - we have to sanitize the argument for NULL to fix it. Fixes #831
OpenPrinting · Nov 27, 2023 · 59dbbdb · 59dbbdb
2 parents a7a80bd + 609ea2b
commit 59dbbdb
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/cups/raster-interpret.c b/cups/raster-interpret.c
@@ -1047,6 +1047,8 @@ scan_ps(_cups_ps_stack_t *st,		/* I  - Stack */
   int			parens;		/* Parenthesis nesting level */
 
 
+  if (!*ptr)
+    return (NULL);
  /*
   * Skip leading whitespace...
   */