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color-device: Don't write to fields when cancelled

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Writing to fields (in this case the MetaColorDevice::pending_state) in
response to an asynchronous operation that was cancelled means we'll
write to an arbitrary memory location, potentially causing segmentation
faults or memory corruption.

Avoid these segfaults or memory corruption by only updating state if we
weren't cancelled. Also avoid trying to dereference the device pointer
if we're cancelled.

The memory corruption due to this has been causing test flakyness in the
monitor unit tests due, which should now hopefully be fixed.

Fixes: 19837796fe
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2794>
This commit is contained in:
Jonas Ådahl 2023-01-20 15:55:44 +01:00 committed by Marge Bot
parent e4ee40d7ff
commit ad371a4435
1 changed files with 7 additions and 5 deletions
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12
src/backends/meta-color-device.c
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@ -367,13 +367,13 @@ on_cd_device_connected (GObject *source_object,
MetaColorDevice *color_device = user_data;
g_autoptr (GError) error = NULL;
color_device->pending_state &= ~PENDING_CONNECTED;
if (!cd_device_connect_finish (cd_device, res, &error))
{
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
color_device->pending_state &= ~PENDING_CONNECTED;
g_warning ("Failed to connect to colord device %s: %s",
color_device->cd_device_id,
error->message);
@ -384,6 +384,7 @@ on_cd_device_connected (GObject *source_object,
}
else
{
color_device->pending_state &= ~PENDING_CONNECTED;
meta_topic (META_DEBUG_COLOR, "Color device '%s' connected",
color_device->cd_device_id);
}
@ -423,8 +424,6 @@ ensure_device_profile_cb (GObject *source_object,
MetaColorProfile *color_profile;
g_autoptr (GError) error = NULL;
color_device->pending_state &= ~PENDING_EDID_PROFILE;
color_profile = meta_color_store_ensure_device_profile_finish (color_store,
res,
&error);
@ -436,6 +435,7 @@ ensure_device_profile_cb (GObject *source_object,
g_warning ("Failed to create device color profile: %s", error->message);
color_device->pending_state &= ~PENDING_EDID_PROFILE;
g_cancellable_cancel (color_device->cancellable);
meta_color_device_notify_ready (color_device, FALSE);
return;
@ -444,6 +444,7 @@ ensure_device_profile_cb (GObject *source_object,
meta_topic (META_DEBUG_COLOR, "Color device '%s' generated",
color_device->cd_device_id);
color_device->pending_state &= ~PENDING_EDID_PROFILE;
g_set_object (&color_device->device_profile, color_profile);
if (!meta_color_profile_is_ready (color_profile))
@ -647,7 +648,7 @@ on_profile_written (GObject *source_object,
GFile *file = G_FILE (source_object);
g_autoptr (GTask) task = G_TASK (user_data);
GenerateProfileData *data = g_task_get_task_data (task);
MetaColorManager *color_manager = data->color_device->color_manager;
MetaColorManager *color_manager;
g_autoptr (GError) error = NULL;
MetaColorProfile *color_profile;
@ -668,6 +669,7 @@ on_profile_written (GObject *source_object,
meta_topic (META_DEBUG_COLOR, "On-disk device profile '%s' updated",
g_file_peek_path (file));
color_manager = data->color_device->color_manager;
color_profile =
meta_color_profile_new_from_icc (color_manager,
g_steal_pointer (&data->cd_icc),