can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing header

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing header The driver expects to receive a struct gs_host_frame in gs_usb_receive_bulk_callback(). Use struct_group to describe the header of the struct gs_host_frame and check that we have at least received the header before accessing any members of it. To resubmit the URB, do not dereference the pointer chain "dev->parent->hf_size_rx" but use "parent->hf_size_rx" instead. Since "urb->context" contains "parent", it is always defined, while "dev" is not defined if the URB it too short.

References

• https://git.kernel.org/stable/c/18cbce43363c9f84b90a92d57df341155eee0697
• https://git.kernel.org/stable/c/3433680b759646efcacc64fe36aa2e51ae34b8f0
• https://git.kernel.org/stable/c/616eee3e895b8ca0028163fcb1dce5e3e9dea322
• https://git.kernel.org/stable/c/f31693dc3a584c0ad3937e857b59dbc1a7ed2b87
• https://git.kernel.org/stable/c/6fe9f3279f7d2518439a7962c5870c6e9ecbadcf