[PATCH v3] riscv: Fix a NULL pointer dereference in machine_kexec_prepare

[Markus Elfring]

…
> Fix this by simply adding a check before copy.

                                           a data copy attempt?



> Fixes: b7fb4d78a6ad ("RISC-V: use memcpy for kexec_file mode")

See also once more:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/stable-kernel-rules.rst?h=v7.2-rc1#n34


Would a summary phrase like “Prevent null pointer dereference in machine_kexec_prepare()”
be nicer?

Regards,
Markus