Index: stand/libsa/zfs/zfsimpl.c
===================================================================
--- stand/libsa/zfs/zfsimpl.c
+++ stand/libsa/zfs/zfsimpl.c
@@ -151,6 +151,8 @@
 static uint64_t dnode_cache_bn;
 static char *dnode_cache_buf;
 
+static int zfs_dnode_stat(const spa_t *spa, const dnode_phys_t *dn, struct stat *sb);
+
 static int zio_read(const spa_t *spa, const blkptr_t *bp, void *buf);
 static int zfs_get_root(const spa_t *spa, uint64_t *objid);
 static int zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result);
@@ -2349,6 +2351,19 @@
 		return (EIO);
 	}
 
+	/*
+	 * Handle odd block sizes, mirrors dmu_read_impl().  Data can't exist
+	 * past the first block, so we'll clip the read to the portion of the
+	 * buffer within bsize and zero out the remainder.
+	 */
+	if (dnode->dn_maxblkid == 0) {
+		size_t newbuflen;
+
+		newbuflen = offset > bsize ? 0 : MIN(buflen, bsize - offset);
+		bzero((char *)buf + newbuflen, buflen - newbuflen);
+		buflen = newbuflen;
+	}
+
 	/*
 	 * Note: bsize may not be a power of two here so we need to do an
 	 * actual divide rather than a bitshift.
@@ -3521,7 +3536,7 @@
 }
 
 static int
-zfs_dnode_stat(const spa_t *spa, dnode_phys_t *dn, struct stat *sb)
+zfs_dnode_stat(const spa_t *spa, const dnode_phys_t *dn, struct stat *sb)
 {
 
 	if (dn->dn_bonustype != DMU_OT_SA) {