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upstream: grow destination buffer more aggressively to avoid bad

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worst-case behaviour when lots of characters that need escaping are processed

Anthropic ANT-2026-P8BKU1E3

OpenBSD-Commit-ID: 864b76c7cd9c91c9a2b692e93d99b1ce0b0d32c3
This commit is contained in:
djm@openbsd.org authored and Damien Miller committed 2026-10-30 20:13:04 +11:00
1 parent e7b23fc20f
commit 07e9138c87
1 file changed
+7 -2
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utf8.c
+7 -2
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@@ -1,4 +1,4 @@
/* $OpenBSD: utf8.c,v 1.11 2020/05/01 06:28:52 djm Exp $ */
/* $OpenBSD: utf8.c,v 1.12 2026/10/30 03:40:56 djm Exp $ */
/*
* Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
*
@@ -77,7 +77,12 @@ grow_dst(char **dst, size_t *sz, size_t maxsz, char **dp, size_t need)
if (*dp + need < *dst + *sz)
return 0;
tsz = *sz + 128;
/*
* Grow geometrically to avoid recallocarray repeatedly having to
* copy its buffer as the allocation grows.
* Note: maxsz is always <=INT_MAX so we can't overflow the size_t;
*/
tsz = *sz + (*sz > 128 ? *sz : 128);
if (tsz > maxsz)
tsz = maxsz;
if ((tp = recallocarray(*dst, *sz, tsz, 1)) == NULL)