zlib: add patch for CVE-2022-37434

This commit is contained in:
Robert Scott
2022-08-07 14:41:48 +01:00
parent c5367ef65c
commit c8f7a21ea2
2 changed files with 33 additions and 0 deletions
@@ -0,0 +1,32 @@
From eff308af425b67093bab25f80f1ae950166bece1 Mon Sep 17 00:00:00 2001
From: Mark Adler <fork@madler.net>
Date: Sat, 30 Jul 2022 15:51:11 -0700
Subject: [PATCH] Fix a bug when getting a gzip header extra field with
inflate().
If the extra field was larger than the space the user provided with
inflateGetHeader(), and if multiple calls of inflate() delivered
the extra header data, then there could be a buffer overflow of the
provided space. This commit assures that provided space is not
exceeded.
---
inflate.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/inflate.c b/inflate.c
index 7be8c6366..7a7289749 100644
--- a/inflate.c
+++ b/inflate.c
@@ -763,9 +763,10 @@ int flush;
copy = state->length;
if (copy > have) copy = have;
if (copy) {
+ len = state->head->extra_len - state->length;
if (state->head != Z_NULL &&
- state->head->extra != Z_NULL) {
- len = state->head->extra_len - state->length;
+ state->head->extra != Z_NULL &&
+ len < state->head->extra_max) {
zmemcpy(state->head->extra + len, next,
len + copy > state->head->extra_max ?
state->head->extra_max - len : copy);
@@ -48,6 +48,7 @@ stdenv.mkDerivation (rec {
# TODO: remove the patch if upstream releases https://github.com/madler/zlib/commit/ec3df00224d4b396e2ac6586ab5d25f673caa4c2
# see https://github.com/NixOS/nixpkgs/issues/170539 for history.
./comprehensive-crc-validation-for-wrong-implementations.patch
./CVE-2022-37434.patch
];
strictDeps = true;