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Avoid invalid read and uninitialized comparisons
https://bugs.gentoo.org/915782
https://puszcza.gnu.org.ua/bugs/?611
This backports the following upstream commits:
r1387
Author: karl
Date: Thu Oct 12 16:10:29 2023 UTC
avoid negative index into font_tbl
r1391
Author: karl
Date: Fri Oct 13 22:34:24 2023 UTC
zero htf_4hf array to avoid uninitialized reads
--- tex4ht-1.0.2009_06_11_1038/src/tex4ht.c
+++ tex4ht-1.0.2009_06_11_1038/src/tex4ht.c
@@ -7039,6 +7039,7 @@
max_htf_4hf_n = 256;
htf_4hf = m_alloc(struct htf_4hf_rec, 256);
+memset (htf_4hf, 0, 256 * sizeof (struct htf_4hf_rec));
@@ -8738,7 +8739,7 @@
if( span_on && !in_span_ch && !ignore_chs && !in_accenting
- && (default_font != font_tbl[cur_fnt].num) ){
+ && cur_fnt >= 0 && (default_font != font_tbl[cur_fnt].num) ){
if( (ch < 137) && (ch !=
132
) ){
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