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udf: Check length of extended attributes and allocation descriptors

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Check length of extended attributes and allocation descriptors when
loading inodes from disk. Otherwise corrupted filesystems could confuse
the code and make the kernel oops.

Reported-by: Carl Henrik Lunde <chlunde@ping.uio.no>
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2015-01-07 13:49:08 +01:00
parent 7914495427
commit 23b133bdc4
1 changed files with 9 additions and 0 deletions
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9
fs/udf/inode.c
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@ -1487,6 +1487,15 @@ reread:
}
inode->i_generation = iinfo->i_unique;
/*
* Sanity check length of allocation descriptors and extended attrs to
* avoid integer overflows
*/
if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
goto out;
/* Now do exact checks */
if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
goto out;
/* Sanity checks for files in ICB so that we don't get confused later */
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
/*