[PATCH] net: stmmac: fix kernel panic due to NULL pointer dereference of mdio_bus_data

[Jakub Kicinski]

On Fri, 28 May 2021 12:40:56 +0530 Sriranjani P wrote:
> Fixed link does not need mdio bus and in that case mdio_bus_data will
> not be allocated. Before using mdio_bus_data we should check for NULL.
> 
> This patch fix the kernel panic due to NULL pointer dereference of
> mdio_bus_data when it is not allocated.
> 
> Without this patch we do see following kernel crash caused due to kernel
> NULL pointer dereference.

Applied, thanks.