forked from enlightenment/efl
elm fileselector: fix possible premature deletion of Listing_Request struct
In a case where eina_promise_then is executed immediately (like with some quick and light Efl.Model), the Listing_Request struct will be prematurely freed in the first iteration of the child processing loop, because the item_total counter had not accumulated the right number of items yet. With this commit, we traverse the children accessor first, so we can know the number of items. Also, no longer use the Listing_Request pointer after the loop, once it may have been deallocate already. And put a note about this too.
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@ -774,7 +774,17 @@ _process_child_error_cb(void *data, Eina_Error err EINA_UNUSED)
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ERR("Failed to access to a model property");
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lreq->item_total--;
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++(lreq->item_processed_count);
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if (lreq->item_processed_count >= lreq->item_total)
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{
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if (!lreq->valid)
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{
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_listing_request_cleanup(lreq);
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return;
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}
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_signal_first(lreq);
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_process_last(lreq);
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}
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}
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static void
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@ -800,8 +810,7 @@ _process_children_cb(void *data, void *values)
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Elm_Fileselector_Item_Data *it_data = NULL;
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const char *path = NULL;
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const char *selected_path = NULL;
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void *child = NULL;
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unsigned int i = 0;
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unsigned int count = 0;
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Elm_Fileselector_Data *sd = lreq->sd;
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if (!lreq->valid)
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@ -829,7 +838,16 @@ _process_children_cb(void *data, void *values)
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lreq->path = eina_stringshare_add(path);
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if (children_accessor)
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{
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EINA_ACCESSOR_FOREACH(children_accessor, i, child)
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Eina_List *children = NULL;
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void *child = NULL;
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EINA_ACCESSOR_FOREACH(children_accessor, count, child)
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{
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children = eina_list_append(children, child);
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}
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lreq->item_total = count;
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EINA_LIST_FREE(children, child)
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{
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Eina_Promise *promises[7];
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Eina_Promise *promise_all = NULL;
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@ -862,11 +880,13 @@ _process_children_cb(void *data, void *values)
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promises[6] = NULL;
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promise_all = eina_promise_all(eina_carray_iterator_new((void**)promises));
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++(lreq->item_total);
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eina_promise_then(promise_all, _process_child_cb, _process_child_error_cb, it_data);
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}
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// NOTE: lreq may have been deallocated in the previous loop
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lreq = NULL;
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}
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if (lreq->item_total == 0)
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if (count == 0)
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{
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_signal_first(lreq);
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_process_last(lreq);
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