35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
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From 208dea486fa24081cbc0cf05fa5a15c802e2bc68 Mon Sep 17 00:00:00 2001
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From: John Lightsey <jd@cpanel.net>
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Date: Wed, 20 Nov 2019 20:02:45 -0600
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Subject: [PATCH v528 1/3] regcomp.c: Prevent integer overflow from nested
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regex quantifiers.
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(CVE-2020-10543) On 32bit systems the size calculations for nested regular
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expression quantifiers could overflow causing heap memory corruption.
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Fixes: Perl/perl5-security#125
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---
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regcomp.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/regcomp.c b/regcomp.c
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index e1da15a77c..dd18add1db 100644
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--- a/regcomp.c
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+++ b/regcomp.c
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@@ -5102,6 +5139,12 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
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(void)ReREFCNT_inc(RExC_rx_sv);
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}
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+ if ( ( minnext > 0 && mincount >= SSize_t_MAX / minnext )
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+ || min >= SSize_t_MAX - minnext * mincount )
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+ {
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+ FAIL("Regexp out of space");
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+ }
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+
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min += minnext * mincount;
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is_inf_internal |= deltanext == SSize_t_MAX
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|| (maxcount == REG_INFTY && minnext + deltanext > 0);
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--
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2.20.1
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