CVE-2024-42282

In the Linux kernel, the following vulnerability has been resolved:

net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling

Move the freeing of the dummy netdevice from mtkfreedev() to mtkremove().

Previously, if allocnetdevdummy() failed in mtkprobe(), eth->dummydev would be NULL. The error path would then call mtkfreedev(), which in turn called freenetdev() assuming dummydev was allocated (but it was not), potentially causing a NULL pointer dereference.

By moving freenetdev() to mtkremove(), we ensure it's only called when mtkprobe() has succeeded and dummydev is fully allocated. This addresses a potential NULL pointer dereference detected by Smatch[1].