In commit 91eefc05f0ac71902906b2058360e61bd25137fe Author: Daniel Vetter <daniel.vet...@ffwll.ch> Date: Wed Dec 14 00:08:10 2016 +0100
drm: Tighten locking in drm_mode_getconnector I reordered the logic a bit in that IOCTL, but that broke userspace since it'll get the new mode list, but not the new property values. Fix that again. v2: Fix up the error path handling when copy_to_user for the modes failes (Dhinakaran). Fixes: 91eefc05f0ac ("drm: Tighten locking in drm_mode_getconnector") Cc: Sean Paul <seanp...@chromium.org> Cc: Daniel Vetter <daniel.vet...@intel.com> Cc: Jani Nikula <jani.nik...@linux.intel.com> Cc: David Airlie <airl...@linux.ie> Cc: dri-devel@lists.freedesktop.org Reported-by: "H.J. Lu" <hjl.to...@gmail.com> Tested-by: "H.J. Lu" <hjl.to...@gmail.com> Cc: <sta...@vger.kernel.org> # v4.11+ Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100576 Cc: "H.J. Lu" <hjl.to...@gmail.com> Cc: "Pandiyan, Dhinakaran" <dhinakaran.pandi...@intel.com> Signed-off-by: Daniel Vetter <daniel.vet...@intel.com> --- drivers/gpu/drm/drm_connector.c | 38 ++++++++++++++++++++------------------ 1 file changed, 20 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 5cd61aff7857..8072e6e4c62c 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -1293,21 +1293,6 @@ int drm_mode_getconnector(struct drm_device *dev, void *data, if (!connector) return -ENOENT; - drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); - encoder = drm_connector_get_encoder(connector); - if (encoder) - out_resp->encoder_id = encoder->base.id; - else - out_resp->encoder_id = 0; - - ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic, - (uint32_t __user *)(unsigned long)(out_resp->props_ptr), - (uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr), - &out_resp->count_props); - drm_modeset_unlock(&dev->mode_config.connection_mutex); - if (ret) - goto out_unref; - for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) if (connector->encoder_ids[i] != 0) encoders_count++; @@ -1320,7 +1305,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data, if (put_user(connector->encoder_ids[i], encoder_ptr + copied)) { ret = -EFAULT; - goto out_unref; + goto out; } copied++; } @@ -1364,15 +1349,32 @@ int drm_mode_getconnector(struct drm_device *dev, void *data, if (copy_to_user(mode_ptr + copied, &u_mode, sizeof(u_mode))) { ret = -EFAULT; + mutex_unlock(&dev->mode_config.mutex); + goto out; } copied++; } } out_resp->count_modes = mode_count; -out: mutex_unlock(&dev->mode_config.mutex); -out_unref: + + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + encoder = drm_connector_get_encoder(connector); + if (encoder) + out_resp->encoder_id = encoder->base.id; + else + out_resp->encoder_id = 0; + + /* Only grab properties after probing, to make sure EDID and other + * properties reflect the latest status. */ + ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic, + (uint32_t __user *)(unsigned long)(out_resp->props_ptr), + (uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr), + &out_resp->count_props); + drm_modeset_unlock(&dev->mode_config.connection_mutex); + +out: drm_connector_put(connector); return ret; -- 2.11.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel