diff options
| author | Johan Hovold <johan+linaro@kernel.org> | 2022-09-13 11:53:13 +0300 |
|---|---|---|
| committer | Abhinav Kumar <quic_abhinavk@quicinc.com> | 2022-09-30 19:57:53 +0300 |
| commit | 2e786eb2f9cebb07e317226b60054df510b60c65 (patch) | |
| tree | 98c0ed064c16a3337c9ca38b9c7e17c4bb624a03 /drivers | |
| parent | 74466e46e7543c7f74f1502181e9ba93f7521374 (diff) | |
| download | linux-2e786eb2f9cebb07e317226b60054df510b60c65.tar.xz | |
drm/msm/dsi: fix memory corruption with too many bridges
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@vger.kernel.org # 4.1
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/502668/
Link: https://lore.kernel.org/r/20220913085320.8577-4-johan+linaro@kernel.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/msm/dsi/dsi.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c index 39bbabb5daf6..8a95c744972a 100644 --- a/drivers/gpu/drm/msm/dsi/dsi.c +++ b/drivers/gpu/drm/msm/dsi/dsi.c @@ -218,6 +218,12 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev, 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); |