udf: Don't BUG on missing metadata partition descriptor

Alden Tondettar · jankara · commit 585d70006f6e · 2016-05-19T11:55:53.000+02:00
Currently, if a metadata partition map is missing its partition descriptor,
then udf_get_pblock_meta25() will BUG() out the first time it is called.
This is rather drastic for a corrupted filesystem, so just treat this case
as an invalid mapping instead.

Signed-off-by: Alden Tondettar &lt;alden.tondettar@gmail.com&gt;
Signed-off-by: Jan Kara &lt;jack@suse.cz&gt;
diff --git a/fs/udf/partition.c b/fs/udf/partition.c
@@ -317,8 +317,9 @@ uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
 	mdata = &map->s_type_specific.s_metadata;
 	inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
 
-	/* We shouldn't mount such media... */
-	BUG_ON(!inode);
+	if (!inode)
+		return 0xFFFFFFFF;
+
 	retblk = udf_try_read_meta(inode, block, partition, offset);
 	if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
 		udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
