In the Linux kernel, the following vulnerability has been resolved:
can: etas_es58x: es58x_read_bulk_callback(): fix RX buffer leak on URB resubmit failure
es58x_read_bulk_callback() resubmits the RX URB after processing a received packet. If the resubmit succeeds, the URB remains anchored and will be handled by the normal RX path or by teardown.
However, if usb_submit_urb() fails, the callback unanchors the URB and then returns directly. This skips the existing free_urb path, so the coherent transfer buffer allocated with usb_alloc_coherent() is not released.
Reuse the existing free_urb path after a resubmit failure so that the RX coherent buffer is freed before leaving the callback.
References
- https://git.kernel.org/stable/c/0ef136ba052101243ba117a1aca6f4a4c3a81142
- https://git.kernel.org/stable/c/19c6c8c6cd5dd14fab5fcd744584812a57cbb78d
- https://git.kernel.org/stable/c/7a0cf2b2497c757c3cb1286eddf2986abb0d387b
- https://git.kernel.org/stable/c/b85e5c310382803d27adf6fe6554d4208bc8951c
- https://git.kernel.org/stable/c/c311f17c261fd375ddf5755f2ebe1f022c19c5b0