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[ Upstream commit fcd7f96c783626c07ee3ed75fa3739a8a2052310 ] Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `of_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function. Cc: stable@vger.kernel.org Signed-off-by: Joonwon Kang <joonwonkang@google.com> Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com> [ changed sp->nargs to sp->args_count in the code and fw_mbox_index_xlate() to of_mbox_index_xlate() in the commit message. ] Signed-off-by: Joonwon Kang <joonwonkang@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Ulrich Hecht <uli@kernel.org>