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-rw-r--r--lib/tdb/common/io.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/tdb/common/io.c b/lib/tdb/common/io.c
index 87d47b970b..11dfefd102 100644
--- a/lib/tdb/common/io.c
+++ b/lib/tdb/common/io.c
@@ -405,6 +405,12 @@ tdb_off_t tdb_expand_adjust(tdb_off_t map_size, tdb_off_t size, int page_size)
/* Round the database up to a multiple of the page size */
new_size = MAX(top_size, new_size);
+
+ if (new_size + page_size < new_size) {
+ /* There's a "+" in TDB_ALIGN that might overflow... */
+ goto overflow;
+ }
+
return TDB_ALIGN(new_size, page_size) - map_size;
overflow: