ASoC: rsnd: check src mod pointer for rsnd_mod_id()

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.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/sh/rcar/cmd.c b/sound/soc/sh/rcar/cmd.c
index 7d92a24b7cfa558afbb8331401c974c59d5f1ae5..98835e9d1d7d13ddc905917a34419e61add7cc83 100644 (file)
--- 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 *mod,
                        [9] = 0x2,
                };
 
+               if (unlikely(!src))
+                       return -EIO;
+
                data = path[rsnd_mod_id(src)] |
                        cmd_case[rsnd_mod_id(src)] << 16;
        }