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twa: guard against highlighting of non-existing edges and states

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For issue #556, reported by Dávid Smolka.  Not sure if this is a
complete fix yet, but that's at least part of the issue.

* spot/twa/twagraph.cc (defrag_states): Skip those unexisting edges
and states while remaping highlight-states and highlight-edges.
* spot/parseaut/parseaut.yy: Likewise for dropped edges.
* tests/python/parsetgba.py: Augment test case.
This commit is contained in:
Alexandre Duret-Lutz 2023-12-04 17:59:09 +01:00
parent 444d4f773d
commit ba86dc6b18
3 changed files with 22 additions and 7 deletions
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5
spot/parseaut/parseaut.yy
View file

@ -2943,9 +2943,12 @@ namespace spot
{
// Update the highlight_edges map to deal with removed/added
// edges.
unsigned ems = r.edge_map.size();
std::map<unsigned, unsigned> remap;
for (auto [edgnum, color]: *r.highlight_edges)
if (edgnum > 0) /* not expected, but can't trust input data */
/* edge numbers outside of the actual number of edges read are
not expected, but we can't trust input data */
if (SPOT_LIKELY(edgnum > 0 && edgnum <= ems))
if (unsigned newnum = r.edge_map[edgnum - 1]; newnum > 0)
remap[newnum] = color;
std::swap(remap, *r.highlight_edges);

12
spot/twa/twagraph.cc
View file

@ -1274,9 +1274,15 @@ namespace spot
if (auto hs = get_named_prop<std::map<unsigned, unsigned>>
("highlight-states"))
{
unsigned ns = newst.size();
std::map<unsigned, unsigned> hs2;
for (auto p: *hs)
{
// Let's just ignore unexisting states. Raising an
// exception here would leave the automaton in a strange
// state.
if (SPOT_UNLIKELY(p.first >= ns))
continue;
unsigned dst = newst[p.first];
if (dst != -1U)
hs2[dst] = p.second;
@ -1306,7 +1312,11 @@ namespace spot
}
std::map<unsigned, unsigned> he2;
for (auto [e, c]: *he)
if (newedges[e] != -1U)
// Let's just ignore unexisting edges. Raising an exception
// here would leave the automaton in a strange state.
if (SPOT_UNLIKELY(e > es))
continue;
else if (newedges[e] != -1U)
he2.emplace(newedges[e], c);
std::swap(*he, he2);
}