diff options
author | 2022-01-06 03:44:55 -0800 | |
---|---|---|
committer | 2022-01-07 14:08:24 +0100 | |
commit | 921b0a863382b70234aeb4bd589c10328e9ff042 (patch) | |
tree | fc7b25e641848c9d76effad07c61aa6aeb20bde5 /swaybar/tray | |
parent | [IPC] Add repeat delay/rate info to keyboard (diff) | |
download | sway-921b0a863382b70234aeb4bd589c10328e9ff042.tar.gz sway-921b0a863382b70234aeb4bd589c10328e9ff042.tar.zst sway-921b0a863382b70234aeb4bd589c10328e9ff042.zip |
input/seat: unset has_focus when focus_stack becomes empty
We currently track the focus of a seat in two ways: we use a list called
focus_stack to track the order in which nodes have been focused, with
the first node representing what's currently focused, and we use a
variable called has_focus to indicate whether anything has focus--i.e.
whether we should actually treat that first node as focused at any given
time.
In a number of places, we treat has_focus as implying that a focused
node exists. If it's true, we attempt to dereference the return value of
seat_get_focus(), our helper function for getting the first node in
focus_list, with no further checks. But this isn't quite correct with
the current implementation of seat_get_focus(): not only does it return
NULL when has_focus is false, it also returns NULL when focus_stack
contains no items.
In most cases, focus_stack never becomes empty and so this doesn't
matter at all. Since focus_stack stores a history of focused nodes, we
rarely remove nodes from it. The exception to this is when a node itself
goes away. In that case, we call seat_node_destroy() to remove it from
focus_stack and free it. But we don't unset has_focus if we've removed
the final node! This lets us get into a state where has_focus is true
but seat_get_focus() returns NULL, leading to a segfault when we try to
dereference it.
Fix the issue both by updating has_focus in seat_node_destroy() and by
adding an assertion in seat_get_focus() that ensures focus_stack and
has_focus are in sync, which will make it easier to track down similar
issues in the future.
Fixes #6395.
[1] There's some discussion in #1585 from when this was implemented
about whether has_focus is actually necessary; it's possible we could
remove it entirely, but for the moment this is the architecture we have.
Diffstat (limited to 'swaybar/tray')
0 files changed, 0 insertions, 0 deletions