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udf: Verify i_size when loading inode

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Verify that inode size is sane when loading inode with data stored in
ICB. Otherwise we may get confused later when working with the inode and
inode size is too big.

CC: stable@vger.kernel.org
Reported-by: Carl Henrik Lunde <chlunde@ping.uio.no>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2014-12-19 12:03:53 +01:00
parent 4e2024624e
commit e159332b9a
1 changed files with 14 additions and 0 deletions
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14
fs/udf/inode.c
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@ -1489,6 +1489,20 @@ reread:
}
inode->i_generation = iinfo->i_unique;
/* Sanity checks for files in ICB so that we don't get confused later */
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
/*
* For file in ICB data is stored in allocation descriptor
* so sizes should match
*/
if (iinfo->i_lenAlloc != inode->i_size)
goto out;
/* File in ICB has to fit in there... */
if (inode->i_size > inode->i_sb->s_blocksize -
udf_file_entry_alloc_offset(inode))
goto out;
}
switch (fe->icbTag.fileType) {
case ICBTAG_FILE_TYPE_DIRECTORY:
inode->i_op = &udf_dir_inode_operations;