28 lines
779 B
Diff
28 lines
779 B
Diff
From 183dadc7fae0994a33901a7246989d2605f5c70c Mon Sep 17 00:00:00 2001
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From: dgp <dgp@users.sourceforge.net>
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Date: Mon, 5 Feb 2018 13:41:26 +0000
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Subject: [PATCH 0879/1800] Improved overflow prevention.
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---
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generic/tclStringObj.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c
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index 8437555ed..c3a0192d8 100644
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--- a/generic/tclStringObj.c
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+++ b/generic/tclStringObj.c
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@@ -190,8 +190,8 @@ GrowUnicodeBuffer(
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* Subsequent appends - apply the growth algorithm.
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*/
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- attempt = 2 * needed;
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- if (attempt >= 0 && attempt <= STRING_MAXCHARS) {
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+ if (needed <= STRING_MAXCHARS / 2) {
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+ attempt = 2 * needed;
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ptr = stringAttemptRealloc(stringPtr, attempt);
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}
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if (ptr == NULL) {
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--
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2.19.1
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