From: Colin Ian King <[email protected]>
Since moving to the new debug helper functions we now have a debug message
that dereferences crtc to print a kernel debug message when crtc is null
and so this debug message will now cause a null pointer dereference. Since
this is a debug message it probably is just simplest to fix this by just
removing the debug message altogether.
Addresses-Coverity: ("Dereference after null check")
Fixes: e3aae683e861 ("drm: convert drm_atomic_uapi.c to new debug helpers")
Signed-off-by: Colin Ian King <[email protected]>
---
drivers/gpu/drm/drm_atomic_uapi.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 9df7f2a170e3..3fd84590560a 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -338,11 +338,6 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
"Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
connector->base.id, connector->name,
conn_state, crtc->base.id, crtc->name);
- } else {
- drm_dbg_atomic(crtc->dev,
- "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
- connector->base.id, connector->name,
- conn_state);
}
return 0;
--
2.28.0
On Monday, November 16, 2020 12:03 PM, Colin King <[email protected]> wrote:
> From: Colin Ian King [email protected]
>
> Since moving to the new debug helper functions we now have a debug message
> that dereferences crtc to print a kernel debug message when crtc is null
> and so this debug message will now cause a null pointer dereference. Since
> this is a debug message it probably is just simplest to fix this by just
> removing the debug message altogether.
NACK. This removes the log altogether instead of fixing it.
A fix has already been pushed to drm-misc-next: 0003b687ee6d ("drm: fix
oops in drm_atomic_set_crtc_for_connector").
On 16/11/2020 11:08, Simon Ser wrote:
> On Monday, November 16, 2020 12:03 PM, Colin King <[email protected]> wrote:
>
>> From: Colin Ian King [email protected]
>>
>> Since moving to the new debug helper functions we now have a debug message
>> that dereferences crtc to print a kernel debug message when crtc is null
>> and so this debug message will now cause a null pointer dereference. Since
>> this is a debug message it probably is just simplest to fix this by just
>> removing the debug message altogether.
>
> NACK. This removes the log altogether instead of fixing it.
>
> A fix has already been pushed to drm-misc-next: 0003b687ee6d ("drm: fix
> oops in drm_atomic_set_crtc_for_connector").
>
Good to see this has already been fixed. Thanks.
Colin