[PATCH] SoC: mxs-saif: check validity of ids in mxs_saif_probe()

[Alexey Khoroshilov]

There is a check for validity of one of ids in mxs_saif_probe(),
while array dereferece is made by the other id.

The patch adds the check for the second saif id.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
 sound/soc/mxs/mxs-saif.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index 13631003cb7c..a002ab892772 100644
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -735,6 +735,11 @@ static int mxs_saif_probe(struct platform_device *pdev)
        else
                saif->id = ret;
 
+       if (saif->id >= ARRAY_SIZE(mxs_saif)) {
+               dev_err(&pdev->dev, "get wrong saif id\n");
+               return -EINVAL;
+       }
+
        /*
         * If there is no "fsl,saif-master" phandle, it's a saif
         * master.  Otherwise, it's a slave and its phandle points
@@ -749,11 +754,11 @@ static int mxs_saif_probe(struct platform_device *pdev)
                        return ret;
                else
                        saif->master_id = ret;
-       }
 
-       if (saif->master_id >= ARRAY_SIZE(mxs_saif)) {
-               dev_err(&pdev->dev, "get wrong master id\n");
-               return -EINVAL;
+               if (saif->master_id >= ARRAY_SIZE(mxs_saif)) {
+                       dev_err(&pdev->dev, "get wrong master id\n");
+                       return -EINVAL;
+               }
        }
 
        mxs_saif[saif->id] = saif;
-- 
2.7.4