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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-09-19 16:07:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-09-19 18:27:16 +0300
commitbd7a3fe770ebd8391d1c7d072ff88e9e76d063eb (patch)
tree7c3907fa163d0cf35761735ae3c6d8e59a9ee8cd /include/uapi
parentbcd6a7aa13800afc1418e6b29d944d882214939a (diff)
downloadlinux-bd7a3fe770ebd8391d1c7d072ff88e9e76d063eb.tar.xz
USB: fix out-of-bounds in usb_set_configuration
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> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/usb/ch9.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index ce1169af39d7..2a5d63040a0b 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -780,6 +780,7 @@ struct usb_interface_assoc_descriptor {
__u8 iFunction;
} __attribute__ ((packed));
+#define USB_DT_INTERFACE_ASSOCIATION_SIZE 8
/*-------------------------------------------------------------------------*/