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udf: Fix BUG on corrupted inode

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When inode is corrupted so that extent type is invalid, some functions
(such as udf_truncate_extents()) will just BUG. Check that extent type
is valid when loading the inode to memory.

Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2018-12-12 14:29:20 +01:00
parent 3e159b9553
commit d288d95842
1 changed files with 6 additions and 0 deletions
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6
fs/udf/inode.c
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@ -1357,6 +1357,12 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
ICBTAG_FLAG_AD_MASK;
if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
ret = -EIO;
goto out;
}
iinfo->i_unique = 0;
iinfo->i_lenEAttr = 0;
iinfo->i_lenExtents = 0;