* [PATCH] drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()
@ 2020-01-07 11:30 Boris Brezillon
2020-01-07 12:15 ` Laurent Pinchart
0 siblings, 1 reply; 3+ messages in thread
From: Boris Brezillon @ 2020-01-07 11:30 UTC (permalink / raw)
To: Andrzej Hajda, Neil Armstrong, Laurent Pinchart, Jonas Karlman,
Jernej Skrabec
Cc: intel-gfx-trybot, Boris Brezillon, dri-devel
drm_atomic_bridge_chain_check() callers can pass a NULL bridge. Let's
bail out before derefencing the bridge pointer when that happens.
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Fixes: b86d895524ab ("drm/bridge: Add an ->atomic_check() hook")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
drivers/gpu/drm/drm_bridge.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index da28967bc586..f6f020854e83 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -941,15 +941,19 @@ int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
struct drm_connector_state *conn_state)
{
struct drm_connector *conn = conn_state->connector;
- struct drm_encoder *encoder = bridge->encoder;
+ struct drm_encoder *encoder;
struct drm_bridge *iter;
int ret;
+ if (!bridge)
+ return 0;
+
ret = drm_atomic_bridge_chain_select_bus_fmts(bridge, crtc_state,
conn_state);
if (ret)
return ret;
+ encoder = bridge->encoder;
list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
int ret;
--
2.23.0
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^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()
2020-01-07 11:30 [PATCH] drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check() Boris Brezillon
@ 2020-01-07 12:15 ` Laurent Pinchart
2020-01-07 12:29 ` Chris Wilson
0 siblings, 1 reply; 3+ messages in thread
From: Laurent Pinchart @ 2020-01-07 12:15 UTC (permalink / raw)
To: Boris Brezillon
Cc: Jernej Skrabec, Jonas Karlman, Neil Armstrong, dri-devel,
intel-gfx-trybot
Hi Boris,
Thank you for the patch.
On Tue, Jan 07, 2020 at 12:30:31PM +0100, Boris Brezillon wrote:
> drm_atomic_bridge_chain_check() callers can pass a NULL bridge. Let's
> bail out before derefencing the bridge pointer when that happens.
>
> Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
> Fixes: b86d895524ab ("drm/bridge: Add an ->atomic_check() hook")
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> drivers/gpu/drm/drm_bridge.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index da28967bc586..f6f020854e83 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -941,15 +941,19 @@ int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
> struct drm_connector_state *conn_state)
> {
> struct drm_connector *conn = conn_state->connector;
> - struct drm_encoder *encoder = bridge->encoder;
> + struct drm_encoder *encoder;
> struct drm_bridge *iter;
> int ret;
>
> + if (!bridge)
> + return 0;
> +
> ret = drm_atomic_bridge_chain_select_bus_fmts(bridge, crtc_state,
> conn_state);
> if (ret)
> return ret;
>
> + encoder = bridge->encoder;
> list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
> int ret;
>
--
Regards,
Laurent Pinchart
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()
2020-01-07 12:15 ` Laurent Pinchart
@ 2020-01-07 12:29 ` Chris Wilson
0 siblings, 0 replies; 3+ messages in thread
From: Chris Wilson @ 2020-01-07 12:29 UTC (permalink / raw)
To: Boris Brezillon, Laurent Pinchart
Cc: Jernej Skrabec, Jonas Karlman, Neil Armstrong, dri-devel,
intel-gfx-trybot
Quoting Laurent Pinchart (2020-01-07 12:15:47)
> Hi Boris,
>
> Thank you for the patch.
>
> On Tue, Jan 07, 2020 at 12:30:31PM +0100, Boris Brezillon wrote:
> > drm_atomic_bridge_chain_check() callers can pass a NULL bridge. Let's
> > bail out before derefencing the bridge pointer when that happens.
> >
> > Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Fixes: b86d895524ab ("drm/bridge: Add an ->atomic_check() hook")
> > Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
CI is back to its normal grumpy self,
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-01-07 11:30 [PATCH] drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check() Boris Brezillon
2020-01-07 12:15 ` Laurent Pinchart
2020-01-07 12:29 ` Chris Wilson
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