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    Subject[PATCH AUTOSEL 4.20 170/304] udf: Fix BUG on corrupted inode
    Date
    From: Jan Kara <jack@suse.cz>

    [ Upstream commit d288d95842f1503414b7eebce3773bac3390457e ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/udf/inode.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/fs/udf/inode.c b/fs/udf/inode.c
    index 5df554a9f9c9..ae796e10f68b 100644
    --- a/fs/udf/inode.c
    +++ b/fs/udf/inode.c
    @@ -1357,6 +1357,12 @@ reread:

    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;
    --
    2.19.1
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