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udf: Don't BUG on missing metadata partition descriptor 

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 <alden.tondettar@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Alden Tondettar 2016-05-18 14:09:17 -07:00 committed by Jan Kara
parent 2600a46ee0
commit 585d70006f
1 changed files with 3 additions and 2 deletions
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5
fs/udf/partition.c
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@ -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");