This is a note to let you know that I've just added the patch titled
drm/msm/dsi: fix memory corruption with too many bridges
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-dsi-fix-memory-corruption-with-too-many-bridges.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2e786eb2f9cebb07e317226b60054df510b60c65 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
Date: Tue, 13 Sep 2022 10:53:13 +0200
Subject: drm/msm/dsi: fix memory corruption with too many bridges
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
commit 2e786eb2f9cebb07e317226b60054df510b60c65 upstream.
Add the missing sanity check on the bridge counter to avoid corrupting
data beyond the fixed-sized bridge array in case there are ever more
than eight bridges.
Fixes: a689554ba6ed ("drm/msm: Initial add DSI connector support")
Cc: stable@xxxxxxxxxxxxxxx # 4.1
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Tested-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
Reviewed-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/502668/
Link: https://lore.kernel.org/r/20220913085320.8577-4-johan+linaro@xxxxxxxxxx
Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/dsi/dsi.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -212,6 +212,12 @@ int msm_dsi_modeset_init(struct msm_dsi
return -EINVAL;
priv = dev->dev_private;
+
+ if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
+ DRM_DEV_ERROR(dev->dev, "too many bridges\n");
+ return -ENOSPC;
+ }
+
msm_dsi->dev = dev;
ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
Patches currently in stable-queue which might be from johan+linaro@xxxxxxxxxx are
queue-5.15/drm-msm-dsi-fix-memory-corruption-with-too-many-bridges.patch
queue-5.15/drm-msm-hdmi-fix-memory-corruption-with-too-many-bridges.patch
queue-5.15/drm-msm-dp-fix-irq-lifetime.patch
