[PATCH] regex: fix assertion in re_node_set_insert

[Egor Ignatov]

* lib/regexec.c (proceed_next_node): Add duplicate insertion
check for eps_via_nodes set.

Signed-off-by: Egor Ignatov <egori@altlinux.org>
---
 lib/regexec.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/regexec.c b/lib/regexec.c
index 23b984a21..c05b92783 100644
--- a/lib/regexec.c
+++ b/lib/regexec.c
@@ -1220,10 +1220,12 @@ proceed_next_node (const re_match_context_t *mctx, Idx 
nregs, regmatch_t *regs,
     {
       re_node_set *cur_nodes = &mctx->state_log[*pidx]->nodes;
       re_node_set *edests = &dfa->edests[node];
-      bool ok = re_node_set_insert (eps_via_nodes, node);
-      if (__glibc_unlikely (! ok))
-       return -2;
-
+      if(!re_node_set_contains (eps_via_nodes, node))
+       {
+         bool ok = re_node_set_insert (eps_via_nodes, node);
+         if (__glibc_unlikely (! ok))
+           return -2;
+       }
       /* Pick a valid destination, or return -1 if none is found.  */
       Idx dest_node = -1;
       for (Idx i = 0; i < edests->nelem; i++)
-- 
2.29.3