Messages in this thread | | | Subject | Re: [PATCH] drm_aux-dev: fix error handling in drm_dp_aux_dev_init() | From | Alexey Khoroshilov <> | Date | Fri, 23 Sep 2016 12:26:05 +0200 |
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Dear Daniel,
Sorry for long response.
> Applied to drm-misc, thanks for the patch. Out of curiosity, how > exactly did you spot this bug?
We use static analysis tools that check various rules on correct usage of kernel core API. An example of error trace for the rm_dp_aux_dev case you can see here [1].
Some addition details are described in a paper [2].
[1] http://linuxtesting.org/results/impl_reports_admin?action=preview&num=137 [2] http://www.ispras.ru/en/publications/configurable_toolset_for_static_verification_of_operating_systems_kernel_modules.pdf
Best regards, Alexey
On 12.07.2016 14:11, Daniel Vetter wrote: > On Thu, Jun 30, 2016 at 12:52:15AM +0300, Alexey Khoroshilov wrote: >> If class_create() fails, there is no need for class_destroy(). >> >> Found by Linux Driver Verification project (linuxtesting.org). >> >> Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> > > Applied to drm-misc, thanks for the patch. Out of curiosity, how exactly > did you spot this bug? > -Daniel > >> --- >> drivers/gpu/drm/drm_dp_aux_dev.c | 3 +-- >> 1 file changed, 1 insertion(+), 2 deletions(-) >> >> diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c >> index 3334baacf43d..734f86a345f6 100644 >> --- a/drivers/gpu/drm/drm_dp_aux_dev.c >> +++ b/drivers/gpu/drm/drm_dp_aux_dev.c >> @@ -355,8 +355,7 @@ int drm_dp_aux_dev_init(void) >> >> drm_dp_aux_dev_class = class_create(THIS_MODULE, "drm_dp_aux_dev"); >> if (IS_ERR(drm_dp_aux_dev_class)) { >> - res = PTR_ERR(drm_dp_aux_dev_class); >> - goto out; >> + return PTR_ERR(drm_dp_aux_dev_class); >> } >> drm_dp_aux_dev_class->dev_groups = drm_dp_aux_groups; >> >> -- >> 1.9.1 >> >> _______________________________________________ >> dri-devel mailing list >> dri-devel@lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/dri-devel >
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