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onscreen/native: Check frame_info for null in finish frame callback

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While adjusting the monitor layout of my docked laptop, mutter got a
segfault while attempting to dereference the frame_info struct. This
happened on gnome-shell 44.4-1.fc38.

cogl_onscreen_peek_head_frame_info() just forwards the call to
g_queue_peek_head() which returns NULL in the event that the queue is
empty. If finish_frame_result_feedback() is expected to always be called
with a non-empty queue there's still a bug somewhere, but regardless
this API can legitimately return NULL so it should be checked for prior
to dereferencing.

Fixes: 61801a713a ("onscreen/native: Avoid freezing the frame clock on failed cursor commits")
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3229>
This commit is contained in:
Jeremy Cline 2023-08-30 15:43:43 -04:00 committed by Robert Mader
parent fb640783e8
commit 379996a63e
1 changed files with 6 additions and 0 deletions
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6
src/backends/native/meta-onscreen-native.c
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@ -1530,6 +1530,12 @@ finish_frame_result_feedback (const MetaKmsFeedback *kms_feedback,
g_warning ("Cursor update failed: %s", error->message);
frame_info = cogl_onscreen_peek_head_frame_info (onscreen);
if (!frame_info)
{
g_warning ("The feedback callback was called, but there was no frame info");
return;
}
frame_info->flags |= COGL_FRAME_INFO_FLAG_SYMBOLIC;
meta_onscreen_native_notify_frame_complete (onscreen);