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udf: Detect incorrect directory size 

commit fa65653e57 upstream.

Detect when a directory entry is (possibly partially) beyond directory
size and return EIO in that case since it means the filesystem is
corrupted. Otherwise directory operations can further corrupt the
directory and possibly also oops the kernel.

CC: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
CC: stable@vger.kernel.org
Reported-and-tested-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Jan Kara 2018-06-13 12:09:22 +02:00 committed by Greg Kroah-Hartman
parent d08dfdeaf4
commit 1b241aa840
1 changed files with 3 additions and 0 deletions
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3
fs/udf/directory.c
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@ -151,6 +151,9 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
sizeof(struct fileIdentDesc));
}
}
/* Got last entry outside of dir size - fs is corrupted! */
if (*nf_pos > dir->i_size)
return NULL;
return fi;
}