[PATCH 4.9 002/177] ASoC: rsnd: check src mod pointer for rsnd_mod_id()

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kuninori Morimoto <kuninori.morimoto...@renesas.com>

commit 374503c6109e60f48fa9b11341b14466f07bd3f4 upstream.

Without this patch, gcc 4.9.x says

    sound/soc/sh/rcar/cmd.c: In function 'rsnd_cmd_init':
    sound/soc/sh/rcar/cmd.c:85:14: warning: array subscript is below array\
        bounds [-Warray-bounds]
        data = path[rsnd_mod_id(src)] |

Signed-off-by: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Cc: Guenter Roeck <li...@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 sound/soc/sh/rcar/cmd.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/sound/soc/sh/rcar/cmd.c
+++ b/sound/soc/sh/rcar/cmd.c
@@ -82,6 +82,9 @@ static int rsnd_cmd_init(struct rsnd_mod
                        [9] = 0x2,
                };
 
+               if (unlikely(!src))
+                       return -EIO;
+
                data = path[rsnd_mod_id(src)] |
                        cmd_case[rsnd_mod_id(src)] << 16;
        }