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[PATCH] regex: fix match with possessive quantifier

From: Egor Ignatov
Subject: [PATCH] regex: fix match with possessive quantifier
Date: Wed, 26 May 2021 12:08:19 +0300

Fix behaviour introduced in 70b673e, where regexps with
possessive quantifier("*+") didn't match.
* lib/regexec.c
(set_regs): Pop if CUR_NODE has already been checked only when
we have a fail stack.

Signed-off-by: Egor Ignatov <egori@altlinux.org>
Hi Paul,

Do you have any test cases for bug 11053(glibc) for gnulib?
This patch fixes the issue with "*+", but I'm not sure it
doesn't break your fix for 11053.

Best regards,

 lib/regexec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/regexec.c b/lib/regexec.c
index 6309deac8..5d4113c9d 100644
--- a/lib/regexec.c
+++ b/lib/regexec.c
@@ -1414,7 +1414,7 @@ set_regs (const regex_t *preg, const re_match_context_t 
*mctx, size_t nmatch,
       update_regs (dfa, pmatch, prev_idx_match, cur_node, idx, nmatch);
       if ((idx == pmatch[0].rm_eo && cur_node == mctx->last_node)
-         || re_node_set_contains (&eps_via_nodes, cur_node))
+         || (fs && re_node_set_contains (&eps_via_nodes, cur_node)))
          Idx reg_idx;
          cur_node = -1;

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