diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2017-10-18 12:49:38 -0400 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-11-18 19:26:59 +0100 |
| commit | fc58fa3ff9944d80be497f264675b9546ab8a318 (patch) | |
| tree | c59a4fb19fe38e4ae4a08aa4115c679740d07ca7 /drivers/usb/core/config.c | |
| parent | a7af0f1f7823ddabff5f92ad8526cbb3cbcc015e (diff) | |
UPSTREAM: USB: core: fix out-of-bounds access bug in usb_get_bos_descriptor()
commit 1c0edc3633b56000e18d82fc241e3995ca18a69e
Andrey used the syzkaller fuzzer to find an out-of-bounds memory
access in usb_get_bos_descriptor(). The code wasn't checking that the
next usb_dev_cap_header structure could fit into the remaining buffer
space.
This patch fixes the error and also reduces the bNumDeviceCaps field
in the header to match the actual number of capabilities found, in
cases where there are fewer than expected.
Change-Id: Ica990541695ce5ba46ca8d2bd01e8230dcf5dcd4
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/config.c')
| -rw-r--r-- | drivers/usb/core/config.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index d6481cb46..50649a30d 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -897,10 +897,12 @@ int usb_get_bos_descriptor(struct usb_device *dev) for (i = 0; i < num; i++) { buffer += length; cap = (struct usb_dev_cap_header *)buffer; - length = cap->bLength; - if (total_len < length) + if (total_len < sizeof(*cap) || total_len < cap->bLength) { + dev->bos->desc->bNumDeviceCaps = i; break; + } + length = cap->bLength; total_len -= length; if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) { |