* [PATCH] ALSA: hda: cs35l41: fix double free in cs35l41_hda_probe()
@ 2022-01-08 14:07 trix
[not found] ` <CAHp75VfbSmgeyi=8q1_he7mpGrNxYAOewKYWD=h8BSuxz2XWOw@mail.gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: trix @ 2022-01-08 14:07 UTC (permalink / raw)
To: james.schulman, david.rhodes, tanureal, perex, tiwai, nathan,
ndesaulniers
Cc: alsa-devel, patches, linux-kernel, llvm, Tom Rix
From: Tom Rix <trix@redhat.com>
Clang static analysis reports this problem
cs35l41_hda.c:501:2: warning: Attempt to free released memory
kfree(acpi_hw_cfg);
^~~~~~~~~~~~~~~~~~
This second free happens in the function's error handler which
is normally ok but acpi_hw_cfg is freed in the non error case
when it is still possible to have an error.
Consolidate the frees.
Fixes: 7b2f3eb492da ("ALSA: hda: cs35l41: Add support for CS35L41 in HDA systems")
Signed-off-by: Tom Rix <trix@redhat.com>
---
sound/pci/hda/cs35l41_hda.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index aa5bb6977792c..265ace98965f5 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -476,7 +476,6 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
ret = cs35l41_hda_apply_properties(cs35l41, acpi_hw_cfg);
if (ret)
goto err;
- kfree(acpi_hw_cfg);
if (cs35l41->reg_seq->probe) {
ret = regmap_register_patch(cs35l41->regmap, cs35l41->reg_seq->probe,
@@ -495,13 +494,14 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
dev_info(cs35l41->dev, "Cirrus Logic CS35L41 (%x), Revision: %02X\n", regid, reg_revid);
- return 0;
-
err:
kfree(acpi_hw_cfg);
- if (!cs35l41->vspk_always_on)
- gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
- gpiod_put(cs35l41->reset_gpio);
+
+ if (unlikely(ret)) {
+ if (!cs35l41->vspk_always_on)
+ gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
+ gpiod_put(cs35l41->reset_gpio);
+ }
return ret;
}
--
2.26.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] ALSA: hda: cs35l41: fix double free in cs35l41_hda_probe()
[not found] ` <0c0926d9-9b72-1519-7e22-e90ffc229940@redhat.com>
@ 2022-01-10 10:21 ` Andy Shevchenko
2022-01-11 16:11 ` Takashi Iwai
0 siblings, 1 reply; 3+ messages in thread
From: Andy Shevchenko @ 2022-01-10 10:21 UTC (permalink / raw)
To: Tom Rix
Cc: james.schulman, david.rhodes, tanureal, perex, tiwai, nathan,
ndesaulniers, alsa-devel, patches, linux-kernel, llvm
On Mon, Jan 10, 2022 at 2:37 AM Tom Rix <trix@redhat.com> wrote:
> On 1/9/22 2:33 PM, Andy Shevchenko wrote:
> On Saturday, January 8, 2022, <trix@redhat.com> wrote:
...
>> + if (unlikely(ret)) {
>
> This is double weird. First of all, wtf unlikely is here? Second, I commented on the patch that does something with this driver and pointed out to the return 0 in some cases. This one seems a band aid.
>
> Unlikely to have an error.
We don't use likely() and unlikely() here and there, you need to
provide a very good justification of its use.
For the record, I forwarded you my review against the code where you
can find much more issues with it that are subject to fix / amend.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] ALSA: hda: cs35l41: fix double free in cs35l41_hda_probe()
2022-01-10 10:21 ` Andy Shevchenko
@ 2022-01-11 16:11 ` Takashi Iwai
0 siblings, 0 replies; 3+ messages in thread
From: Takashi Iwai @ 2022-01-11 16:11 UTC (permalink / raw)
To: Tom Rix
Cc: Andy Shevchenko, james.schulman, david.rhodes, tanureal, perex,
tiwai, nathan, ndesaulniers, alsa-devel, patches, linux-kernel,
llvm
On Mon, 10 Jan 2022 11:21:11 +0100,
Andy Shevchenko wrote:
>
> On Mon, Jan 10, 2022 at 2:37 AM Tom Rix <trix@redhat.com> wrote:
> > On 1/9/22 2:33 PM, Andy Shevchenko wrote:
> > On Saturday, January 8, 2022, <trix@redhat.com> wrote:
>
> ...
>
> >> + if (unlikely(ret)) {
> >
> > This is double weird. First of all, wtf unlikely is here? Second, I commented on the patch that does something with this driver and pointed out to the return 0 in some cases. This one seems a band aid.
> >
> > Unlikely to have an error.
>
> We don't use likely() and unlikely() here and there, you need to
> provide a very good justification of its use.
>
> For the record, I forwarded you my review against the code where you
> can find much more issues with it that are subject to fix / amend.
For this particular bug fix, Dan submitted a simpler patch and I took
it now:
https://lore.kernel.org/r/20220111072232.GG11243@kili
thanks,
Takashi
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-01-08 14:07 [PATCH] ALSA: hda: cs35l41: fix double free in cs35l41_hda_probe() trix
[not found] ` <CAHp75VfbSmgeyi=8q1_he7mpGrNxYAOewKYWD=h8BSuxz2XWOw@mail.gmail.com>
[not found] ` <0c0926d9-9b72-1519-7e22-e90ffc229940@redhat.com>
2022-01-10 10:21 ` Andy Shevchenko
2022-01-11 16:11 ` Takashi Iwai
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