CVE-2021-47558

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: stmmac: Disable Tx queues when reconfiguring the interface<br /> <br /> The Tx queues were not disabled in situations where the driver needed to<br /> stop the interface to apply a new configuration. This could result in a<br /> kernel panic when doing any of the 3 following actions:<br /> * reconfiguring the number of queues (ethtool -L)<br /> * reconfiguring the size of the ring buffers (ethtool -G)<br /> * installing/removing an XDP program (ip l set dev ethX xdp)<br /> <br /> Prevent the panic by making sure netif_tx_disable is called when stopping<br /> an interface.<br /> <br /> Without this patch, the following kernel panic can be observed when doing<br /> any of the actions above:<br /> <br /> Unable to handle kernel paging request at virtual address ffff80001238d040<br /> [....]<br /> Call trace:<br /> dwmac4_set_addr+0x8/0x10<br /> dev_hard_start_xmit+0xe4/0x1ac<br /> sch_direct_xmit+0xe8/0x39c<br /> __dev_queue_xmit+0x3ec/0xaf0<br /> dev_queue_xmit+0x14/0x20<br /> [...]<br /> [ end trace 0000000000000002 ]---