net: wwan: mhi: fix memory leak in mhi_mbim_dellink

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: wwan: mhi: fix memory leak in mhi_mbim_dellink MHI driver registers network device without setting the needs_free_netdev flag, and does NOT call free_netdev() when unregisters network device, which causes a memory leak. This patch sets needs_free_netdev to true when registers network device, which makes netdev subsystem call free_netdev() automatically after unregister_netdevice().

References

• https://git.kernel.org/stable/c/2845bc9070cef0c651987487d84d4813d64675dd
• https://git.kernel.org/stable/c/3cd3ffe952f78ec5dadf300cb58d4b38a0c0106d
• https://git.kernel.org/stable/c/668205b9c9f94d5ed6ab00cce9a46a654c2b5d16