30 lines
1.2 KiB
Diff
30 lines
1.2 KiB
Diff
From afa90858991e87762da12c5ba8adcf00ee1bd731 Mon Sep 17 00:00:00 2001
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From: Mark Adler <fork@madler.net>
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Date: Sat, 30 Jul 2022 15:51:11 -0700
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Subject: [PATCH] [Backport]Fix a bug when getting a gzip header extra field
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CVE:CVE-2022-37434
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Reference:https://github.com/madler/zlib/commit/eff308af425b67093bab25f80f1ae950166bece1
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---
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inflate.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/inflate.c b/inflate.c
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index ffb1b69..c1a1dcc 100644
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--- a/inflate.c
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+++ b/inflate.c
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@@ -777,8 +777,9 @@ int flush;
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if (copy > have) copy = have;
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if (copy) {
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if (state->head != Z_NULL &&
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- state->head->extra != Z_NULL) {
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- len = state->head->extra_len - state->length;
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+ state->head->extra != Z_NULL &&
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+ (len = state->head->extra_len - state->length) <
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+ state->head->extra_max) {
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zmemcpy(state->head->extra + len, next,
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len + copy > state->head->extra_max ?
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state->head->extra_max - len : copy);
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--
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2.1.4
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