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screencopy: fix segfault on disabled output 

Disconnecting or disabling an output between capture_output() and
ready() could cause either a NULL dereference or an incorrect
attach_render_locks count.
This commit is contained in:
Jason Francis 2019-07-27 19:20:49 -04:00 committed by Simon Ser
parent ca45f4490c
commit ce3e413e83
1 changed files with 32 additions and 20 deletions
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46
types/wlr_screencopy_v1.c
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@ -23,10 +23,12 @@ static void frame_destroy(struct wlr_screencopy_frame_v1 *frame) {
if (frame == NULL) {
return;
}
if (frame->output != NULL && frame->buffer != NULL) {
wlr_output_lock_attach_render(frame->output, false);
if (frame->cursor_locked) {
wlr_output_lock_software_cursors(frame->output, false);
}
}
wl_list_remove(&frame->link);
wl_list_remove(&frame->output_precommit.link);
wl_list_remove(&frame->buffer_destroy.link);
@ -104,6 +106,12 @@ static void frame_handle_copy(struct wl_client *client,
struct wlr_output *output = frame->output;
if (!output->enabled) {
zwlr_screencopy_frame_v1_send_failed(frame->resource);
frame_destroy(frame);
return;
}
struct wl_shm_buffer *buffer = wl_shm_buffer_get(buffer_resource);
if (buffer == NULL) {
wl_resource_post_error(frame->resource,
@ -180,23 +188,6 @@ static void capture_output(struct wl_client *client,
struct wlr_screencopy_manager_v1 *manager, uint32_t version, uint32_t id,
int32_t overlay_cursor, struct wlr_output *output,
const struct wlr_box *box) {
struct wlr_box buffer_box = {0};
if (box == NULL) {
buffer_box.width = output->width;
buffer_box.height = output->height;
} else {
int ow, oh;
wlr_output_effective_resolution(output, &ow, &oh);
buffer_box = *box;
wlr_box_transform(&buffer_box, &buffer_box, output->transform, ow, oh);
buffer_box.x *= output->scale;
buffer_box.y *= output->scale;
buffer_box.width *= output->scale;
buffer_box.height *= output->scale;
}
struct wlr_screencopy_frame_v1 *frame =
calloc(1, sizeof(struct wlr_screencopy_frame_v1));
if (frame == NULL) {
@ -222,6 +213,10 @@ static void capture_output(struct wl_client *client,
wl_list_init(&frame->output_precommit.link);
wl_list_init(&frame->buffer_destroy.link);
if (output == NULL || !output->enabled) {
goto error;
}
struct wlr_renderer *renderer = wlr_backend_get_renderer(output->backend);
assert(renderer);
@ -231,6 +226,23 @@ static void capture_output(struct wl_client *client,
goto error;
}
struct wlr_box buffer_box = {0};
if (box == NULL) {
buffer_box.width = output->width;
buffer_box.height = output->height;
} else {
int ow, oh;
wlr_output_effective_resolution(output, &ow, &oh);
buffer_box = *box;
wlr_box_transform(&buffer_box, &buffer_box, output->transform, ow, oh);
buffer_box.x *= output->scale;
buffer_box.y *= output->scale;
buffer_box.width *= output->scale;
buffer_box.height *= output->scale;
}
frame->box = buffer_box;
frame->stride = 4 * buffer_box.width; // TODO: depends on read format