From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 26 Aug 2020 07:07:09 +0000 (-0700)
Subject: regex-emacs: copy less when reallocating
X-Git-Tag: emacs-28.0.90~6393
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=e823709d1755cb4fd087f2a9ba92d350dd32fe47;p=emacs.git

regex-emacs: copy less when reallocating

* src/regex-emacs.c (GROW_FAIL_STACK): Copy just the
occupied stack slots, as the rest are garbage.
---

diff --git a/src/regex-emacs.c b/src/regex-emacs.c
index 3d8aaf4bb13..971a5f63749 100644
--- a/src/regex-emacs.c
+++ b/src/regex-emacs.c
@@ -929,7 +929,7 @@ typedef struct
    ? 0									\
    : ((fail_stack).stack						\
       = REGEX_REALLOCATE ((fail_stack).stack,				\
-	  (fail_stack).size * sizeof (fail_stack_elt_t),		\
+	  (fail_stack).avail * sizeof (fail_stack_elt_t),		\
           min (emacs_re_max_failures * TYPICAL_FAILURE_SIZE,                  \
                ((fail_stack).size * FAIL_STACK_GROWTH_FACTOR))          \
           * sizeof (fail_stack_elt_t)),                                 \