From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 25 Feb 2023 15:19:15 +0000 (+0200)
Subject: Fix infloop in bidi.c
X-Git-Tag: emacs-29.0.90~320
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=ab0cc4e7811;p=emacs.git

Fix infloop in bidi.c

* src/bidi.c (bidi_set_paragraph_end): Reset the isolate_level to
zero.  Whenever stack_idx is reset to zero, the isolate_level must
also be reset, since there cannot be any isolate status outside of
embeddings.  Failure to reset isolate_level will cause us infloop
when we see a PDI.  Reported by Matt Beshara <m@mfa.pw>.
---

diff --git a/src/bidi.c b/src/bidi.c
index 93875d243e4..3c26ae19322 100644
--- a/src/bidi.c
+++ b/src/bidi.c
@@ -1126,6 +1126,7 @@ bidi_set_paragraph_end (struct bidi_it *bidi_it)
   bidi_it->invalid_levels = 0;
   bidi_it->invalid_isolates = 0;
   bidi_it->stack_idx = 0;
+  bidi_it->isolate_level = 0;
   bidi_it->resolved_level = bidi_it->level_stack[0].level;
 }