tree 5103b4b9ec55c4a5444247afed1d93c1ec77f06d
parent f559836e4416e60f8b72739ddfe1c4aba8861777
author Johan Hovold <johan@kernel.org> 1409133319 +0200
committer chrmhoffmann <chrmhoffmann@gmail.com> 1586074840 +0200

USB: serial: fix potential heap buffer overflow

commit 5654699fb38512bdbfc0f892ce54fce75bdc2bab upstream.

Make sure to verify the number of ports requested by subdriver to avoid
writing beyond the end of fixed-size array in interface data.

The current usb-serial implementation is limited to eight ports per
interface but failed to verify that the number of ports requested by a
subdriver (which could have been determined from device descriptors) did
not exceed this limit.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[lizf: Backported to 3.4: s/ddev/\&interface->dev/]
Signed-off-by: Zefan Li <lizefan@huawei.com>