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zlib: Incorporate fix for CVE-2022-37434

Browse Source 
https://www.cve.org/CVERecord?id=CVE-2022-37434

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
This commit is contained in:
Peter Müller
2022-08-07 09:18:45 +00:00
parent f25f1b55af
commit 30f0ea198d
2 changed files with 33 additions and 0 deletions
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29
src/patches/zlib-CVE-2022-37434.patch Normal file
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@@ -0,0 +1,29 @@
commit eff308af425b67093bab25f80f1ae950166bece1
Author: Mark Adler <fork@madler.net>
Date: Sat Jul 30 15:51:11 2022 -0700
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.
diff --git a/inflate.c b/inflate.c
index 7be8c63..7a72897 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);