4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Payer <mathias.payer@xxxxxxxxxxxxx> commit 704620afc70cf47abb9d6a1a57f3825d2bca49cf upstream. When reading an extra descriptor, we need to properly check the minimum and maximum size allowed, to prevent from invalid data being sent by a device. Reported-by: Hui Peng <benquike@xxxxxxxxx> Reported-by: Mathias Payer <mathias.payer@xxxxxxxxxxxxx> Co-developed-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Hui Peng <benquike@xxxxxxxxx> Signed-off-by: Mathias Payer <mathias.payer@xxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/hub.c | 2 +- drivers/usb/core/usb.c | 6 +++--- drivers/usb/host/hwa-hc.c | 2 +- include/linux/usb.h | 4 ++-- 4 files changed, 7 insertions(+), 7 deletions(-) --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2211,7 +2211,7 @@ static int usb_enumerate_device_otg(stru /* descriptor may appear anywhere in config */ err = __usb_get_extra_descriptor(udev->rawdescriptors[0], le16_to_cpu(udev->config[0].desc.wTotalLength), - USB_DT_OTG, (void **) &desc); + USB_DT_OTG, (void **) &desc, sizeof(*desc)); if (err || !(desc->bmAttributes & USB_OTG_HNP)) return 0; --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -678,14 +678,14 @@ EXPORT_SYMBOL_GPL(usb_get_current_frame_ */ int __usb_get_extra_descriptor(char *buffer, unsigned size, - unsigned char type, void **ptr) + unsigned char type, void **ptr, size_t minsize) { struct usb_descriptor_header *header; while (size >= sizeof(struct usb_descriptor_header)) { header = (struct usb_descriptor_header *)buffer; - if (header->bLength < 2) { + if (header->bLength < 2 || header->bLength > size) { printk(KERN_ERR "%s: bogus descriptor, type %d length %d\n", usbcore_name, @@ -694,7 +694,7 @@ int __usb_get_extra_descriptor(char *buf return -1; } - if (header->bDescriptorType == type) { + if (header->bDescriptorType == type && header->bLength >= minsize) { *ptr = header; return 0; } --- a/drivers/usb/host/hwa-hc.c +++ b/drivers/usb/host/hwa-hc.c @@ -654,7 +654,7 @@ static int hwahc_security_create(struct top = itr + itr_size; result = __usb_get_extra_descriptor(usb_dev->rawdescriptors[index], le16_to_cpu(usb_dev->actconfig->desc.wTotalLength), - USB_DT_SECURITY, (void **) &secd); + USB_DT_SECURITY, (void **) &secd, sizeof(*secd)); if (result == -1) { dev_warn(dev, "BUG? WUSB host has no security descriptors\n"); return 0; --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -334,11 +334,11 @@ struct usb_host_bos { }; int __usb_get_extra_descriptor(char *buffer, unsigned size, - unsigned char type, void **ptr); + unsigned char type, void **ptr, size_t min); #define usb_get_extra_descriptor(ifpoint, type, ptr) \ __usb_get_extra_descriptor((ifpoint)->extra, \ (ifpoint)->extralen, \ - type, (void **)ptr) + type, (void **)ptr, sizeof(**(ptr))) /* ----------------------------------------------------------------------- */