udf: Detect incorrect directory size

commit fa65653e575fbd958bdf5fb9c4a71a324e39510d 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>

diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index 0a98a2369738fc2cff925c80066b92a58b299066..3835f983cc99ff335a052c990f259640ce09fa84 100644 (file)
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -152,6 +152,9 @@ 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;
 }