Re: [PATCH 5.10 086/103] regmap: debugfs: Fix a memory leak when calling regmap_attach_dev

Pavel Machek
2021-01-15T20:27:39Z

[-- Attachment #1: Type: text/plain, Size: 843 bytes --]

Hi!

> > From: Xiaolei Wang <xiaolei.wang@windriver.com>
> >
> > commit cffa4b2122f5f3e53cf3d529bbc74651f95856d5 upstream.
> >
> > After initializing the regmap through
> > syscon_regmap_lookup_by_compatible, then regmap_attach_dev to the
> > device, because the debugfs_name has been allocated, there is no
> > need to redistribute it again
>
> ? redistribute?
>
> Anyway, this patch is clearly buggy:
>
> >
> > if (!strcmp(name, "dummy")) {
> > - kfree(map->debugfs_name);
> > + if (!map->debugfs_name)
> > + kfree(map->debugfs_name);
> >
>
> It runs kfree only if the variable is NULL. That's clearly useless,
> kfree(NULL) is NOP, and this causes memory leak.

103/ of the series fixes this up. Sorry for the noise...

Best regards,
Pavel
--
http://www.livejournal.com/~pavelmachek

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]