1 files changed, 18 insertions, 0 deletions
diff --git a/qemu_mode/patches/afl-qemu-common.h b/qemu_mode/patches/afl-qemu-common.h
index 1da3359d..409a7eab 100644
--- a/qemu_mode/patches/afl-qemu-common.h
+++ b/qemu_mode/patches/afl-qemu-common.h
@@ -81,3 +81,21 @@ void tcg_gen_afl_compcov_log_call(void *func, target_ulong cur_loc,
 
 void tcg_gen_afl_maybe_log_call(target_ulong cur_loc);
 
+
+/* Check if an address is valid in the current mapping */
+
+static inline int is_valid_addr(target_ulong addr) {
+
+  int          l, flags;
+  target_ulong page;
+  void *       p;
+
+  page = addr & TARGET_PAGE_MASK;
+  l = (page + TARGET_PAGE_SIZE) - addr;
+
+  flags = page_get_flags(page);
+  if (!(flags & PAGE_VALID) || !(flags & PAGE_READ)) return 0;
+
+  return 1;
+
+}