Merge tag 'xfs-4.20-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:

- fix incorrect dropping of error code from bmap

- print buffer offsets instead of useless hashed pointers when dumping
corrupt metadata

- fix integer overflow in attribute verifier

* tag 'xfs-4.20-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: fix overflow in xfs_attr3_leaf_verify
xfs: print buffer offsets when dumping corrupt buffers
xfs: Fix error code in 'xfs_ioc_getbmap()'

fs/xfs/libxfs/xfs_attr_leaf.c

···
 	struct xfs_mount		*mp = bp->b_target->bt_mount;
 	struct xfs_attr_leafblock	*leaf = bp->b_addr;
 	struct xfs_attr_leaf_entry	*entries;
-	uint16_t			end;
+	uint32_t			end;	/* must be 32bit - see below */
 	int				i;
 
 	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
···
 	/*
 	 * Quickly check the freemap information.  Attribute data has to be
 	 * aligned to 4-byte boundaries, and likewise for the free space.
+	 *
+	 * Note that for 64k block size filesystems, the freemap entries cannot
+	 * overflow as they are only be16 fields. However, when checking end
+	 * pointer of the freemap, we have to be careful to detect overflows and
+	 * so use uint32_t for those checks.
 	 */
 	for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
 		if (ichdr.freemap[i].base > mp->m_attr_geo->blksize)
···
 			return __this_address;
 		if (ichdr.freemap[i].size & 0x3)
 			return __this_address;
-		end = ichdr.freemap[i].base + ichdr.freemap[i].size;
+
+		/* be care of 16 bit overflows here */
+		end = (uint32_t)ichdr.freemap[i].base + ichdr.freemap[i].size;
 		if (end < ichdr.freemap[i].base)
 			return __this_address;
 		if (end > mp->m_attr_geo->blksize)

fs/xfs/xfs_ioctl.c

···
 	error = 0;
 out_free_buf:
 	kmem_free(buf);
-	return 0;
+	return error;
 }
 
 struct getfsmap_info {

fs/xfs/xfs_message.c

···
 void
 xfs_hex_dump(void *p, int length)
 {
-	print_hex_dump(KERN_ALERT, "", DUMP_PREFIX_ADDRESS, 16, 1, p, length, 1);
+	print_hex_dump(KERN_ALERT, "", DUMP_PREFIX_OFFSET, 16, 1, p, length, 1);
 }