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bpf: Reject writes for PTR_TO_MAP_KEY in check_helper_mem_access
commit 7b3552d upstream. It is not permitted to write to PTR_TO_MAP_KEY, but the current code in check_helper_mem_access would allow for it, reject this case as well, as helpers taking ARG_PTR_TO_UNINIT_MEM also take PTR_TO_MAP_KEY. Fixes: 69c087b ("bpf: Add bpf_for_each_map_elem() helper") Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20220319080827.73251-4-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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