udf: Handle VAT packed inside inode properly

We didn't handle VAT packed inside the inode - we tried to call udf_block_map()
on such file which lead to strange results at best. Add proper handling of
packed VAT as we do it with other packed files.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 15 insertions, 9 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 14f965e8a738..abdb9b31da46 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1107,7 +1107,10 @@ static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
         struct udf_sb_info *sbi = UDF_SB(sb);
         struct udf_part_map *map = &sbi->s_partmaps[p_index];
         kernel_lb_addr ino;
-        struct buffer_head *bh;
+        struct buffer_head *bh = NULL;
+        struct udf_inode_info *vati;
+        uint32_t pos;
+        struct virtualAllocationTable20 *vat20;
 
         /* VAT file entry is in the last recorded block */
         ino.partitionReferenceNum = type1_index;
@@ -1122,15 +1125,18 @@ static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
                 map->s_type_specific.s_virtual.s_num_entries =
                         (sbi->s_vat_inode->i_size - 36) >> 2;
         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
-                uint32_t pos;
-                struct virtualAllocationTable20 *vat20;
+                vati = UDF_I(sbi->s_vat_inode);
+                if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+                        pos = udf_block_map(sbi->s_vat_inode, 0);
+                        bh = sb_bread(sb, pos);
+                        if (!bh)
+                                return 1;
+                        vat20 = (struct virtualAllocationTable20 *)bh->b_data;
+                } else {
+                        vat20 = (struct virtualAllocationTable20 *)
+                                                        vati->i_ext.i_data;
+                }
 
-                pos = udf_block_map(sbi->s_vat_inode, 0);
-                bh = sb_bread(sb, pos);
-                if (!bh)
-                        return 1;
-                vat20 = (struct virtualAllocationTable20 *)bh->b_data +
-                                udf_ext0_offset(sbi->s_vat_inode);
                 map->s_type_specific.s_virtual.s_start_offset =
                         le16_to_cpu(vat20->lengthHeader) +
                         udf_ext0_offset(sbi->s_vat_inode);