diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index cdfa699cd7c8..9d26c5dc4efd 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -1435,6 +1435,11 @@ dbAllocAG(struct bmap * bmp, int agno, s64 nblocks, int l2nb, s64 * results)
 			blkno &= ~(MAXL1SIZE - 1);
 		else		/* bmp->db_aglevel == 0 */
 			blkno &= ~(MAXL0SIZE - 1);
+		
+		if (unlikely(budmin < 0)) {
+   			WARN_ON_ONCE(1);
+    			budmin = 0;
+		}		
 
 		blkno +=
 		    ((s64) (ti - le32_to_cpu(dcp->leafidx))) << budmin;