[FIXED] Protect against going upside down on mb.msgs. (#4575)

Signed-off-by: Derek Collison <derek@nats.io>
nats-io · Sep 22, 2023 · 6fdcd1e · 6fdcd1e
2 parents ece431f + 2716248
commit 6fdcd1e
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/server/filestore.go b/server/filestore.go
@@ -1576,7 +1576,11 @@ func (fs *fileStore) recoverFullState() (rerr error) {
 					return errCorruptState
 				}
 				mb.dmap = *dmap
-				mb.msgs -= numDeleted
+				if mb.msgs > numDeleted {
+					mb.msgs -= numDeleted
+				} else {
+					mb.msgs = 0
+				}
 				bi += n
 			}
 			// Only add in if not empty or the lmb.