Re: [PATCH 00/20] hwmon: check return value after calling platform_get_resource()

[Guenter Roeck]

On 4/23/22 20:35, Yang Yingliang wrote:
> Hi,
>
> On 2022/4/22 21:27, Guenter Roeck wrote:
> > On 4/22/22 02:11, Yang Yingliang wrote:
> > > This patcheset add check after calling platform_get_resource to avoid null-ptr-deref
> > > in drivers/hwmon/.
> > >
> > > Yang Yingliang (20):
> > >    hwmon: (abituguru) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (abituguru3) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (dme1737) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (f71805f) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (f71882fg) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (it87) check return value after calling platform_get_resource()
> > >    hwmon: (lm78) check return value after calling platform_get_resource()
> > >    hwmon: (nct6683) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (nct6775) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (sch5627) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (sch5636) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (sis5595) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (smsc47b397) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (smsc47m1) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (via686a) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (vt1211) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (vt8231) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (w83627ehf) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (w83627hf) check return value after calling
> > >      platform_get_resource()
> > >    hwmon: (w83781d) check return value after calling
> > >      platform_get_resource()
> > >
> > >   drivers/hwmon/abituguru.c  | 6 +++++-
> > >   drivers/hwmon/abituguru3.c | 6 +++++-
> > >   drivers/hwmon/dme1737.c    | 2 ++
> > >   drivers/hwmon/f71805f.c    | 2 ++
> > >   drivers/hwmon/f71882fg.c   | 6 +++++-
> > >   drivers/hwmon/it87.c       | 2 ++
> > >   drivers/hwmon/lm78.c       | 2 ++
> > >   drivers/hwmon/nct6683.c    | 2 ++
> > >   drivers/hwmon/nct6775.c    | 2 ++
> > >   drivers/hwmon/sch5627.c    | 6 +++++-
> > >   drivers/hwmon/sch5636.c    | 6 +++++-
> > >   drivers/hwmon/sis5595.c    | 2 ++
> > >   drivers/hwmon/smsc47b397.c | 2 ++
> > >   drivers/hwmon/smsc47m1.c   | 2 ++
> > >   drivers/hwmon/via686a.c    | 2 ++
> > >   drivers/hwmon/vt1211.c     | 2 ++
> > >   drivers/hwmon/vt8231.c     | 2 ++
> > >   drivers/hwmon/w83627ehf.c  | 2 ++
> > >   drivers/hwmon/w83627hf.c   | 2 ++
> > >   drivers/hwmon/w83781d.c    | 2 ++
> > >   20 files changed, 55 insertions(+), 5 deletions(-)
> >
> > This series solves a problem which does not exist in reality and is only theoretic.
> > The devices are instantiated from their init functions which always adds the resource.
> > Please do not submit such patches.
> As you said the resource will be add in init functions, I checked these drivers, the driver
> sch5627 and sch5636 won't add resource, so need I send patches to fix these drivers ?
You might want to read the code more carefully. The drivers are instantiated
from drivers/hwmon/sch56xx-common.c which does add the resource.

Guenter