CVE-2022-49661

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> can: gs_usb: gs_usb_open/close(): fix memory leak<br /> <br /> The gs_usb driver appears to suffer from a malady common to many USB<br /> CAN adapter drivers in that it performs usb_alloc_coherent() to<br /> allocate a number of USB request blocks (URBs) for RX, and then later<br /> relies on usb_kill_anchored_urbs() to free them, but this doesn&amp;#39;t<br /> actually free them. As a result, this may be leaking DMA memory that&amp;#39;s<br /> been used by the driver.<br /> <br /> This commit is an adaptation of the techniques found in the esd_usb2<br /> driver where a similar design pattern led to a memory leak. It<br /> explicitly frees the RX URBs and their DMA memory via a call to<br /> usb_free_coherent(). Since the RX URBs were allocated in the<br /> gs_can_open(), we remove them in gs_can_close() rather than in the<br /> disconnect function as was done in esd_usb2.<br /> <br /> For more information, see the 928150fad41b ("can: esd_usb2: fix memory<br /> leak").