diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-09-19 15:07:17 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-11-11 13:33:39 +0000 |
| commit | cc81fff9d62e32a27b1f16dab1a6172935792ab7 (patch) | |
| tree | 07da2be1577bf7857e2d77064d143e34aa7a1f99 /include/uapi | |
| parent | c0003557dbdec4ec1976ea7be9534abef758297b (diff) | |
USB: fix out-of-bounds in usb_set_configuration
commit bd7a3fe770ebd8391d1c7d072ff88e9e76d063eb upstream.
Andrey Konovalov reported a possible out-of-bounds problem for a USB interface
association descriptor. He writes:
It seems there's no proper size check of a USB_DT_INTERFACE_ASSOCIATION
descriptor. It's only checked that the size is >= 2 in
usb_parse_configuration(), so find_iad() might do out-of-bounds access
to intf_assoc->bInterfaceCount.
And he's right, we don't check for crazy descriptors of this type very well, so
resolve this problem. Yet another issue found by syzkaller...
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/usb/ch9.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h index a81f5473a801..21c1871c6d23 100644 --- a/include/uapi/linux/usb/ch9.h +++ b/include/uapi/linux/usb/ch9.h @@ -724,6 +724,7 @@ struct usb_interface_assoc_descriptor { __u8 iFunction; } __attribute__ ((packed)); +#define USB_DT_INTERFACE_ASSOCIATION_SIZE 8 /*-------------------------------------------------------------------------*/ |