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core/graph: fix segfault when returned list has length 0

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This commit is contained in:
Riccardo Schirone 2015-10-26 14:39:54 +01:00
parent 02e719fafe
commit efc5f8d917
1 changed files with 14 additions and 10 deletions
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24
libr/core/graph.c
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@ -1404,17 +1404,21 @@ static void analyze_back_edges (const RAGraph *g, RANode *an) {
e->y = r_list_new ();
tp = r_graph_get_neighbours (g->graph, ak->gnode);
fn = r_list_get_bottom (tp);
ln = r_list_get_top (tp);
first = get_anode (fn);
last = get_anode (ln);
if (r_list_length (tp) > 0) {
fn = r_list_get_bottom (tp);
ln = r_list_get_top (tp);
first = get_anode (fn);
last = get_anode (ln);
if (first == an) {
r_list_append (e->x, (void *)(size_t)(an->x - 2 - j));
r_list_append (e->y, (void *)(size_t)ak->y);
} else {
r_list_append (e->x, (void *)(size_t)(last->x + last->w + 2 + j));
r_list_append (e->y, (void *)(size_t)ak->y);
if (first == an) {
r_list_append (e->x,
(void *)(size_t)(an->x - 2 - j));
r_list_append (e->y, (void *)(size_t)ak->y);
} else {
r_list_append (e->x,
(void *)(size_t)(last->x + last->w + 2 + j));
r_list_append (e->y, (void *)(size_t)ak->y);
}
}
r_list_append (g->edges, e);
j++;