From: James Forshaw <fors...@google.com>
3.4.104-rc1 review patch. If anyone has any objections, please let me know.
------------------
commit 6817ae225cd650fb1c3295d769298c38b1eba818 upstream.
This patch fixes a potential security issue in the whiteheat USB driver
which might allow a local attacker to cause kernel memory corrpution. This
is due to an unchecked memcpy into a fixed size buffer (of 64 bytes). On
EHCI and XHCI busses it's possible to craft responses greater than 64
bytes leading a buffer overflow.
Signed-off-by: James Forshaw <fors...@google.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lize...@huawei.com>
---
drivers/usb/serial/whiteheat.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 0d06d7c..bf7014d 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -953,6 +953,10 @@ static void command_port_read_callback(struct urb *urb)
dbg("%s - command_info is NULL, exiting.", __func__);
return;
}
+ if (!urb->actual_length) {
+ dev_dbg(&urb->dev->dev, "%s - empty response, exiting.\n",
__func__);
+ return;
+ }
if (status) {
dbg("%s - nonzero urb status: %d", __func__, status);
if (status != -ENOENT)
@@ -974,7 +978,8 @@ static void command_port_read_callback(struct urb *urb)
/* These are unsolicited reports from the firmware, hence no
waiting command to wakeup */
dbg("%s - event received", __func__);
- } else if (data[0] == WHITEHEAT_GET_DTR_RTS) {
+ } else if ((data[0] == WHITEHEAT_GET_DTR_RTS) &&
+ (urb->actual_length - 1 <=
sizeof(command_info->result_buffer))) {
memcpy(command_info->result_buffer, &data[1],
urb->actual_length - 1);
command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
--
1.7.9.5
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