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* sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function
@ 2018-04-18 11:42 kbuild test robot
  2018-04-20 12:34 ` Andy Shevchenko
  0 siblings, 1 reply; 2+ messages in thread
From: kbuild test robot @ 2018-04-18 11:42 UTC (permalink / raw)
  To: Pierre-Louis Bossart
  Cc: kbuild-all, linux-kernel, Mark Brown, Andy Shevchenko

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Hi Pierre-Louis,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a27fc14219f2e3c4a46ba9177b04d9b52c875532
commit: 4772c16ede522d46219a59646503d2020841a6f4 ASoC: Intel: Kconfig: Simplify-clarify ACPI/PCI dependencies
date:   3 months ago
config: i386-randconfig-b0-04181911 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 4772c16ede522d46219a59646503d2020841a6f4
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   sound/soc/intel/atom/sst/sst_loader.c: In function 'sst_request_fw':
>> sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function [-Wuninitialized]
     if (fw == NULL) {
            ^

vim +/fw +357 sound/soc/intel/atom/sst/sst_loader.c

9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  344  
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  345  /*
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  346   * sst_request_fw - requests audio fw from kernel and saves a copy
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  347   *
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  348   * This function requests the SST FW from the kernel, parses it and
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  349   * saves a copy in the driver context
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  350   */
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  351  static int sst_request_fw(struct intel_sst_drv *sst)
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  352  {
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  353  	int retval = 0;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  354  	const struct firmware *fw;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  355  
5794b7ec sound/soc/intel/sst/sst_loader.c Fang, Yang A 2014-10-30  356  	retval = request_firmware(&fw, sst->firmware_name, sst->dev);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16 @357  	if (fw == NULL) {
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  358  		dev_err(sst->dev, "fw is returning as null\n");
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  359  		return -EINVAL;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  360  	}
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  361  	if (retval) {
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  362  		dev_err(sst->dev, "request fw failed %d\n", retval);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  363  		return retval;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  364  	}
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  365  	mutex_lock(&sst->sst_lock);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  366  	retval = sst_cache_and_parse_fw(sst, fw);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  367  	mutex_unlock(&sst->sst_lock);
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  368  
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  369  	return retval;
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  370  }
9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16  371  

:::::: The code at line 357 was first introduced by commit
:::::: 9012c9544eeac485b2193fea721233907f0847fa ASoC: Intel: mrfld - Add DSP load and management

:::::: TO: Vinod Koul <vinod.koul@intel.com>
:::::: CC: Mark Brown <broonie@kernel.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function
  2018-04-18 11:42 sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used uninitialized in this function kbuild test robot
@ 2018-04-20 12:34 ` Andy Shevchenko
  0 siblings, 0 replies; 2+ messages in thread
From: Andy Shevchenko @ 2018-04-20 12:34 UTC (permalink / raw)
  To: kbuild test robot, Pierre-Louis Bossart
  Cc: kbuild-all, linux-kernel, Mark Brown

On Wed, 2018-04-18 at 19:42 +0800, kbuild test robot wrote:


>    sound/soc/intel/atom/sst/sst_loader.c: In function
> 'sst_request_fw':
> > > sound/soc/intel/atom/sst/sst_loader.c:357:9: warning: 'fw' is used
> > > uninitialized in this function [-Wuninitialized]
> 
>      if (fw == NULL) {
>             ^
> 

Looks like semi-false-positive.

We should check retval first, then check fw. The API has to return an
error in case when fw is not filled correctly.

Otherwise it breaks a rule that input parameters are not altered on
error path (when they are not about error itself of course).

> vim +/fw +357 sound/soc/intel/atom/sst/sst_loader.c
> 
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  344  
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  345  /*
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  346   * sst_request_fw - requests audio fw from kernel and saves a
> copy
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  347   *
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  348   * This function requests the SST FW from the kernel, parses
> it and
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  349   * saves a copy in the driver context
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  350   */
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  351  static int sst_request_fw(struct intel_sst_drv *sst)
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  352  {
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  353  	int retval = 0;
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  354  	const struct firmware *fw;
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  355  
> 5794b7ec sound/soc/intel/sst/sst_loader.c Fang, Yang A 2014-10-
> 30  356  	retval = request_firmware(&fw, sst->firmware_name,
> sst->dev);
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-16
> @357  	if (fw == NULL) {
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  358  		dev_err(sst->dev, "fw is returning as
> null\n");
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  359  		return -EINVAL;
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  360  	}
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  361  	if (retval) {
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  362  		dev_err(sst->dev, "request fw failed %d\n",
> retval);
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  363  		return retval;
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  364  	}
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  365  	mutex_lock(&sst->sst_lock);
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  366  	retval = sst_cache_and_parse_fw(sst, fw);
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  367  	mutex_unlock(&sst->sst_lock);
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  368  
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  369  	return retval;
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  370  }
> 9012c954 sound/soc/intel/sst/sst_loader.c Vinod Koul   2014-10-
> 16  371  
> 
> :::::: The code at line 357 was first introduced by commit
> :::::: 9012c9544eeac485b2193fea721233907f0847fa ASoC: Intel: mrfld -
> Add DSP load and management
> 
> :::::: TO: Vinod Koul <vinod.koul@intel.com>
> :::::: CC: Mark Brown <broonie@kernel.org>
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology
> Center
> https://lists.01.org/pipermail/kbuild-all                   Intel
> Corporation

-- 
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2018-04-20 12:34 ` Andy Shevchenko

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