* [PATCHv2 for v5.3] v4l2-subdev: fix regression in check_pad()
@ 2019-06-29 13:00 Hans Verkuil
2019-07-02 12:15 ` Geert Uytterhoeven
0 siblings, 1 reply; 2+ messages in thread
From: Hans Verkuil @ 2019-06-29 13:00 UTC (permalink / raw)
To: Linux Media Mailing List
Cc: Niklas Söderlund, Janusz Krzysztofik, Sakari Ailus
sd->entity.graph_obj.mdev can be NULL when this function is called, and
that breaks existing drivers (rcar-vin, but probably others as well).
Check if sd->entity.num_pads is non-zero instead since that doesn't depend
on mdev.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Fixes: a8fa55078a77 ("media: v4l2-subdev: Verify arguments in v4l2_subdev_call()")
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
Changes in v2:
- Don't change the coding style, just fix the bug.
---
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 21fb90d66bfc..25c73c13cc7e 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -124,7 +124,7 @@ static inline int check_which(__u32 which)
static inline int check_pad(struct v4l2_subdev *sd, __u32 pad)
{
#if defined(CONFIG_MEDIA_CONTROLLER)
- if (sd->entity.graph_obj.mdev) {
+ if (sd->entity.num_pads) {
if (pad >= sd->entity.num_pads)
return -EINVAL;
return 0;
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCHv2 for v5.3] v4l2-subdev: fix regression in check_pad()
2019-06-29 13:00 [PATCHv2 for v5.3] v4l2-subdev: fix regression in check_pad() Hans Verkuil
@ 2019-07-02 12:15 ` Geert Uytterhoeven
0 siblings, 0 replies; 2+ messages in thread
From: Geert Uytterhoeven @ 2019-07-02 12:15 UTC (permalink / raw)
To: Hans Verkuil
Cc: Linux Media Mailing List, Niklas Söderlund,
Janusz Krzysztofik, Sakari Ailus, linux-renesas-soc
[-- Attachment #1: Type: text/plain, Size: 1272 bytes --]
Hi Hans,
On Sat, 29 Jun 2019, Hans Verkuil wrote:
> sd->entity.graph_obj.mdev can be NULL when this function is called, and
> that breaks existing drivers (rcar-vin, but probably others as well).
>
> Check if sd->entity.num_pads is non-zero instead since that doesn't depend
> on mdev.
>
> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> Reported-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Fixes: a8fa55078a77 ("media: v4l2-subdev: Verify arguments in v4l2_subdev_call()")
> Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Thanks, this fixes the following boot regression on r8a7791/koelsch:
-rcar-vin e6ef0000.video: Device registered as video27
+rcar-vin e6ef0000.video: Unsupported media bus format for adv7612 13-004c
+rcar-vin e6ef0000.video: Notifier registration failed
+rcar-vin: probe of e6ef0000.video failed with error -22
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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