linux-kernel - [PATCH 1/5] gma500: fix a missing break in oaktrail_crtc_mode

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Date:   Wed, 30 Mar 2022 20:02:42 +0800
From:   Xiaomeng Tong <xiam0nd.tong@...il.com>
To:     patrik.r.jakobsson@...il.com, airlied@...ux.ie, daniel@...ll.ch
Cc:     rob@...com, yakui.zhao@...el.com, airlied@...hat.com,
        alan@...ux.intel.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Xiaomeng Tong <xiam0nd.tong@...il.com>
Subject: [PATCH 1/5] gma500: fix a missing break in oaktrail_crtc_mode_set

Instead of exiting the loop as expected when an entry is found, the
list_for_each_entry() continues until the traversal is complete. It
will certainly lead to a invalid reference to list itereator variable
'connector' after the loop pointing an bogus address at an offset
from the list head, and could lead to multiple 'is_*' flags being set
with true mistakely too.

The invalid reference to list itereator is here:
	drm_object_property_get_value(&connector->base,

To fix this, when found the entry, add a break after the switch
statement.

Fixes: a69ac9ea85d87 ("drm/gma500: drm_connector_property -> drm_object_property")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
---
 drivers/gpu/drm/gma500/oaktrail_crtc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/gma500/oaktrail_crtc.c b/drivers/gpu/drm/gma500/oaktrail_crtc.c
index 36c7c2686c90..eb2d79872bd5 100644
--- a/drivers/gpu/drm/gma500/oaktrail_crtc.c
+++ b/drivers/gpu/drm/gma500/oaktrail_crtc.c
@@ -409,6 +409,8 @@ static int oaktrail_crtc_mode_set(struct drm_crtc *crtc,
 			is_mipi = true;
 			break;
 		}
+
+		break;
 	}
 
 	/* Disable the VGA plane that we never use */
-- 
2.17.1