* [linux-next:master 1128/2532] drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
@ 2024-03-31 12:48 kernel test robot
0 siblings, 0 replies; 5+ messages in thread
From: kernel test robot @ 2024-03-31 12:48 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: a6bd6c9333397f5a0e2667d4d82fef8c970108f2
commit: d60bc2995732489766cbe650fc367e036ff6a0e0 [1128/2532] pwm: Add a struct device to struct pwm_chip
:::::: branch date: 3 days ago
:::::: commit date: 6 days ago
config: m68k-randconfig-r071-20240326 (https://download.01.org/0day-ci/archive/20240331/202403312030.QYCgiAey-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202403312030.QYCgiAey-lkp@intel.com/
smatch warnings:
drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
vim +/pwm +1530 drivers/pwm/core.c
8138d2ddbcca2a Thierry Reding 2012-03-26 1521
8138d2ddbcca2a Thierry Reding 2012-03-26 1522 /**
8138d2ddbcca2a Thierry Reding 2012-03-26 1523 * pwm_put() - release a PWM device
8138d2ddbcca2a Thierry Reding 2012-03-26 1524 * @pwm: PWM device
8138d2ddbcca2a Thierry Reding 2012-03-26 1525 */
8138d2ddbcca2a Thierry Reding 2012-03-26 1526 void pwm_put(struct pwm_device *pwm)
8138d2ddbcca2a Thierry Reding 2012-03-26 1527 {
d60bc299573248 Uwe Kleine-König 2024-03-17 @1528 struct pwm_chip *chip = pwm->chip;
d60bc299573248 Uwe Kleine-König 2024-03-17 1529
8138d2ddbcca2a Thierry Reding 2012-03-26 @1530 if (!pwm)
8138d2ddbcca2a Thierry Reding 2012-03-26 1531 return;
8138d2ddbcca2a Thierry Reding 2012-03-26 1532
8138d2ddbcca2a Thierry Reding 2012-03-26 1533 mutex_lock(&pwm_lock);
8138d2ddbcca2a Thierry Reding 2012-03-26 1534
8138d2ddbcca2a Thierry Reding 2012-03-26 1535 if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
e50d3523ff4564 Sachin Kamat 2012-08-10 1536 pr_warn("PWM device already freed\n");
8138d2ddbcca2a Thierry Reding 2012-03-26 1537 goto out;
8138d2ddbcca2a Thierry Reding 2012-03-26 1538 }
8138d2ddbcca2a Thierry Reding 2012-03-26 1539
d60bc299573248 Uwe Kleine-König 2024-03-17 1540 if (chip->ops->free)
8138d2ddbcca2a Thierry Reding 2012-03-26 1541 pwm->chip->ops->free(pwm->chip, pwm);
8138d2ddbcca2a Thierry Reding 2012-03-26 1542
8138d2ddbcca2a Thierry Reding 2012-03-26 1543 pwm->label = NULL;
8138d2ddbcca2a Thierry Reding 2012-03-26 1544
d60bc299573248 Uwe Kleine-König 2024-03-17 1545 put_device(&chip->dev);
d60bc299573248 Uwe Kleine-König 2024-03-17 1546
d60bc299573248 Uwe Kleine-König 2024-03-17 1547 module_put(chip->owner);
8138d2ddbcca2a Thierry Reding 2012-03-26 1548 out:
8138d2ddbcca2a Thierry Reding 2012-03-26 1549 mutex_unlock(&pwm_lock);
8138d2ddbcca2a Thierry Reding 2012-03-26 1550 }
8138d2ddbcca2a Thierry Reding 2012-03-26 1551 EXPORT_SYMBOL_GPL(pwm_put);
8138d2ddbcca2a Thierry Reding 2012-03-26 1552
:::::: The code at line 1530 was first introduced by commit
:::::: 8138d2ddbcca2a100482dac390133f83c5a60f94 pwm: Add table-based lookup for static mappings
:::::: TO: Thierry Reding <thierry.reding@avionic-design.de>
:::::: CC: Thierry Reding <thierry.reding@avionic-design.de>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 5+ messages in thread* [linux-next:master 1128/2532] drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
@ 2024-04-02 14:13 Dan Carpenter
2024-04-02 15:11 ` Uwe Kleine-König
0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2024-04-02 14:13 UTC (permalink / raw)
To: oe-kbuild, Uwe Kleine-König; +Cc: lkp, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: a6bd6c9333397f5a0e2667d4d82fef8c970108f2
commit: d60bc2995732489766cbe650fc367e036ff6a0e0 [1128/2532] pwm: Add a struct device to struct pwm_chip
config: m68k-randconfig-r071-20240326 (https://download.01.org/0day-ci/archive/20240331/202403312030.QYCgiAey-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202403312030.QYCgiAey-lkp@intel.com/
smatch warnings:
drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
vim +/pwm +1530 drivers/pwm/core.c
8138d2ddbcca2a Thierry Reding 2012-03-26 1526 void pwm_put(struct pwm_device *pwm)
8138d2ddbcca2a Thierry Reding 2012-03-26 1527 {
d60bc299573248 Uwe Kleine-König 2024-03-17 @1528 struct pwm_chip *chip = pwm->chip;
^^^^^^^^^^
Dereference
d60bc299573248 Uwe Kleine-König 2024-03-17 1529
8138d2ddbcca2a Thierry Reding 2012-03-26 @1530 if (!pwm)
^^^^
Too late.
8138d2ddbcca2a Thierry Reding 2012-03-26 1531 return;
8138d2ddbcca2a Thierry Reding 2012-03-26 1532
8138d2ddbcca2a Thierry Reding 2012-03-26 1533 mutex_lock(&pwm_lock);
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [linux-next:master 1128/2532] drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
2024-04-02 14:13 Dan Carpenter
@ 2024-04-02 15:11 ` Uwe Kleine-König
2024-04-30 11:08 ` Dan Carpenter
0 siblings, 1 reply; 5+ messages in thread
From: Uwe Kleine-König @ 2024-04-02 15:11 UTC (permalink / raw)
To: Dan Carpenter; +Cc: oe-kbuild, lkp, oe-kbuild-all
[-- Attachment #1: Type: text/plain, Size: 1963 bytes --]
Hello,
On Tue, Apr 02, 2024 at 05:13:15PM +0300, Dan Carpenter wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head: a6bd6c9333397f5a0e2667d4d82fef8c970108f2
> commit: d60bc2995732489766cbe650fc367e036ff6a0e0 [1128/2532] pwm: Add a struct device to struct pwm_chip
> config: m68k-randconfig-r071-20240326 (https://download.01.org/0day-ci/archive/20240331/202403312030.QYCgiAey-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 13.2.0
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> | Closes: https://lore.kernel.org/r/202403312030.QYCgiAey-lkp@intel.com/
>
> smatch warnings:
> drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
>
> vim +/pwm +1530 drivers/pwm/core.c
>
> 8138d2ddbcca2a Thierry Reding 2012-03-26 1526 void pwm_put(struct pwm_device *pwm)
> 8138d2ddbcca2a Thierry Reding 2012-03-26 1527 {
> d60bc299573248 Uwe Kleine-König 2024-03-17 @1528 struct pwm_chip *chip = pwm->chip;
> ^^^^^^^^^^
> Dereference
>
> d60bc299573248 Uwe Kleine-König 2024-03-17 1529
> 8138d2ddbcca2a Thierry Reding 2012-03-26 @1530 if (!pwm)
> ^^^^
> Too late.
>
> 8138d2ddbcca2a Thierry Reding 2012-03-26 1531 return;
> 8138d2ddbcca2a Thierry Reding 2012-03-26 1532
> 8138d2ddbcca2a Thierry Reding 2012-03-26 1533 mutex_lock(&pwm_lock);
This is already addressed in fbf632f9dc55.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [linux-next:master 1128/2532] drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
2024-04-02 15:11 ` Uwe Kleine-König
@ 2024-04-30 11:08 ` Dan Carpenter
2024-04-30 16:59 ` Uwe Kleine-König
0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2024-04-30 11:08 UTC (permalink / raw)
To: Uwe Kleine-König; +Cc: oe-kbuild, lkp, oe-kbuild-all
On Tue, Apr 02, 2024 at 05:11:22PM +0200, Uwe Kleine-König wrote:
> Hello,
>
> > 8138d2ddbcca2a Thierry Reding 2012-03-26 1526 void pwm_put(struct pwm_device *pwm)
> > 8138d2ddbcca2a Thierry Reding 2012-03-26 1527 {
> > d60bc299573248 Uwe Kleine-König 2024-03-17 @1528 struct pwm_chip *chip = pwm->chip;
> > ^^^^^^^^^^
> > Dereference
> >
> > d60bc299573248 Uwe Kleine-König 2024-03-17 1529
> > 8138d2ddbcca2a Thierry Reding 2012-03-26 @1530 if (!pwm)
> > ^^^^
> > Too late.
> >
> > 8138d2ddbcca2a Thierry Reding 2012-03-26 1531 return;
> > 8138d2ddbcca2a Thierry Reding 2012-03-26 1532
> > 8138d2ddbcca2a Thierry Reding 2012-03-26 1533 mutex_lock(&pwm_lock);
>
> This is already addressed in fbf632f9dc55.
>
Apparently we never merged that commit, though... It's not in
linux-next.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [linux-next:master 1128/2532] drivers/pwm/core.c:1530 pwm_put() warn: variable dereferenced before check 'pwm' (see line 1528)
2024-04-30 11:08 ` Dan Carpenter
@ 2024-04-30 16:59 ` Uwe Kleine-König
0 siblings, 0 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2024-04-30 16:59 UTC (permalink / raw)
To: Dan Carpenter; +Cc: oe-kbuild, lkp, oe-kbuild-all
[-- Attachment #1: Type: text/plain, Size: 1439 bytes --]
Hello Dan,
On Tue, Apr 30, 2024 at 02:08:05PM +0300, Dan Carpenter wrote:
> On Tue, Apr 02, 2024 at 05:11:22PM +0200, Uwe Kleine-König wrote:
> > Hello,
> >
> > > 8138d2ddbcca2a Thierry Reding 2012-03-26 1526 void pwm_put(struct pwm_device *pwm)
> > > 8138d2ddbcca2a Thierry Reding 2012-03-26 1527 {
> > > d60bc299573248 Uwe Kleine-König 2024-03-17 @1528 struct pwm_chip *chip = pwm->chip;
> > > ^^^^^^^^^^
> > > Dereference
> > >
> > > d60bc299573248 Uwe Kleine-König 2024-03-17 1529
> > > 8138d2ddbcca2a Thierry Reding 2012-03-26 @1530 if (!pwm)
> > > ^^^^
> > > Too late.
> > >
> > > 8138d2ddbcca2a Thierry Reding 2012-03-26 1531 return;
> > > 8138d2ddbcca2a Thierry Reding 2012-03-26 1532
> > > 8138d2ddbcca2a Thierry Reding 2012-03-26 1533 mutex_lock(&pwm_lock);
> >
> > This is already addressed in fbf632f9dc55.
> >
>
> Apparently we never merged that commit, though... It's not in
> linux-next.
Oh, I recently dropped a few commits from my for-next branch and this
one was (wrongly) among them. Thanks for paying attention, it's back
now.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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^ permalink raw reply [flat|nested] 5+ messages in thread
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2024-04-02 14:13 Dan Carpenter
2024-04-02 15:11 ` Uwe Kleine-König
2024-04-30 11:08 ` Dan Carpenter
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