[Minor] Another sanity check

diff --git a/src/libstat/backends/mmaped_file.c b/src/libstat/backends/mmaped_file.c
index 86538039d81448196a5c8daac6ac183fe1feb9ea..795da8b4dce8aaf1cb69f1ff1ff9a878dc691552 100644 (file)
--- a/src/libstat/backends/mmaped_file.c
+++ b/src/libstat/backends/mmaped_file.c
@@ -494,14 +494,17 @@ rspamd_mmaped_file_reindex (rspamd_mempool_t *pool,
        }
 
        pos = map + (sizeof (struct stat_file) - sizeof (struct stat_file_block));
-       while (old_size - (pos - map) >= sizeof (struct stat_file_block)) {
-               block = (struct stat_file_block *)pos;
-               if (block->hash1 != 0 && block->value != 0) {
-                       rspamd_mmaped_file_set_block_common (pool,
-                                       new, block->hash1,
-                                       block->hash2, block->value);
+
+       if (pos - map < (gssize)old_size) {
+               while ((gssize)old_size - (pos - map) >= (gssize)sizeof (struct stat_file_block)) {
+                       block = (struct stat_file_block *)pos;
+                       if (block->hash1 != 0 && block->value != 0) {
+                               rspamd_mmaped_file_set_block_common (pool,
+                                               new, block->hash1,
+                                               block->hash2, block->value);
+                       }
+                       pos += sizeof (block);
                }
-               pos += sizeof (block);
        }
 
        header = (struct stat_file_header *)map;