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-rw-r--r--src/megolm.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/megolm.c b/src/megolm.c
index 6d8af08..a969b36 100644
--- a/src/megolm.c
+++ b/src/megolm.c
@@ -108,8 +108,12 @@ void megolm_advance_to(Megolm *megolm, uint32_t advance_to) {
uint32_t mask = (~(uint32_t)0) << shift;
int k;
- /* how many times to we need to rehash this part? */
- int steps = (advance_to >> shift) - (megolm->counter >> shift);
+ /* how many times do we need to rehash this part?
+ *
+ * '& 0xff' ensures we handle integer wraparound correctly
+ */
+ unsigned int steps =
+ ((advance_to >> shift) - (megolm->counter >> shift)) & 0xff;
if (steps == 0) {
continue;