CVE-2021-47559

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()<br /> <br /> Coverity reports a possible NULL dereferencing problem:<br /> <br /> in smc_vlan_by_tcpsk():<br /> 6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times).<br /> 7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next.<br /> 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &amp;lower);<br /> CID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS)<br /> 8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev.<br /> 1624 if (is_vlan_dev(ndev)) {<br /> <br /> Remove the manual implementation and use netdev_walk_all_lower_dev() to<br /> iterate over the lower devices. While on it remove an obsolete function<br /> parameter comment.