1 files changed, 5 insertions, 2 deletions
diff --git a/src/common/storagedir.c b/src/common/storagedir.c
index b7d43ddf13..e28a66f693 100644
--- a/src/common/storagedir.c
+++ b/src/common/storagedir.c
@@ -205,8 +205,11 @@ storage_dir_read(storage_dir_t *d, const char *fname, int bin, size_t *sz_out)
   tor_asprintf(&path, "%s/%s", d->directory, fname);
   struct stat st;
   char *contents = read_file_to_str(path, flags, &st);
-  if (contents && sz_out)
-    *sz_out = st.st_size;
+  if (contents && sz_out) {
+    // it fits in RAM, so we know its size is less than SIZE_MAX
+    tor_assert((uint64_t)st.st_size <= SIZE_MAX);
+    *sz_out = (size_t) st.st_size;
+  }
 
   tor_free(path);
   return (uint8_t *) contents;