FAPI: Add size check for reading ima header.

It's now checked whether the complete ima header is read.

Signed-off-by: Juergen Repp <[email protected]>

src/tss2-fapi/ifapi_ima_eventlog.c

@@ -656,11 +656,17 @@ size_t read_ima_header(IFAPI_IMA_TEMPLATE *template, FILE *fp, TSS2_RC *rc)
 
     *rc = TSS2_RC_SUCCESS;
 
-    size = fread(&template->header, header_size, 1, fp);
+    size = fread(&template->header, 1, header_size, fp);
     if (size == 0) {
         return size;
     }
 
+    if (size != header_size) {
+        *rc = TSS2_FAPI_RC_BAD_VALUE;
+        LOG_ERROR("Invalid ima data");
+        return 0;
+    }
+
     template->convert_to_big_endian = need_to_convert_to_big_endian(template);
 
     if (memcmp(&template->header.digest[pos_ima_type], "ima", 3) == 0) {