[PATCH] ASoC: Intel: mrfld: fix uninitialized variable access

[Arnd Bergmann]

Randconfig testing revealed a very old bug, with gcc-8:

sound/soc/intel/atom/sst/sst_loader.c: In function 'sst_load_fw':
sound/soc/intel/atom/sst/sst_loader.c:357:5: error: 'fw' may be used 
uninitialized in this function [-Werror=maybe-uninitialized]
  if (fw == NULL) {
     ^
sound/soc/intel/atom/sst/sst_loader.c:354:25: note: 'fw' was declared here
  const struct firmware *fw;

We must check the return code of request_firmware() before we look at the
pointer result that may be uninitialized when the function fails.

Fixes: 9012c9544eea ("ASoC: Intel: mrfld - Add DSP load and management")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 sound/soc/intel/atom/sst/sst_loader.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/soc/intel/atom/sst/sst_loader.c 
b/sound/soc/intel/atom/sst/sst_loader.c
index 27413ebae956..b8c456753f01 100644
--- a/sound/soc/intel/atom/sst/sst_loader.c
+++ b/sound/soc/intel/atom/sst/sst_loader.c
@@ -354,14 +354,14 @@ static int sst_request_fw(struct intel_sst_drv *sst)
        const struct firmware *fw;
 
        retval = request_firmware(&fw, sst->firmware_name, sst->dev);
-       if (fw == NULL) {
-               dev_err(sst->dev, "fw is returning as null\n");
-               return -EINVAL;
-       }
        if (retval) {
                dev_err(sst->dev, "request fw failed %d\n", retval);
                return retval;
        }
+       if (fw == NULL) {
+               dev_err(sst->dev, "fw is returning as null\n");
+               return -EINVAL;
+       }
        mutex_lock(&sst->sst_lock);
        retval = sst_cache_and_parse_fw(sst, fw);
        mutex_unlock(&sst->sst_lock);
-- 
2.18.0