CVE-2022-48648

In the Linux kernel, the following vulnerability has been resolved: sfc:
fix null pointer dereference in efx_hard_start_xmit Trying to get the
channel from the tx_queue variable here is wrong because we can only be
here if tx_queue is NULL, so we shouldn’t dereference it. As the above
comment in the code says, this is very unlikely to happen, but it’s wrong
anyway so let’s fix it. I hit this issue because of a different bug that
caused tx_queue to be NULL. If that happens, this is the error message that
we get here: BUG: unable to handle kernel NULL pointer dereference at
0000000000000020 […] RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]