Fix-Data-Corruption-Bug-when-Streaming-with-an-Attac.patch

@@ -0,0 +1,38 @@
+From 2c67902d594f7ae37b68cef1692b823b4b497e92 Mon Sep 17 00:00:00 2001
+From: "W. Felix Handte" <w@felixhandte.com>
+Date: Thu, 18 Jul 2019 12:41:12 -0400
+Subject: [PATCH 3/3] Fix Data Corruption Bug when Streaming with an Attached
+ Dict in HC Mode
+
+This diff fixes an issue in which we failed to clear the `dictCtx` in HC
+compression. The `dictCtx` is not supposed to be used when an `extDict` is
+present: matches found in the `dictCtx` do not account for the presence of an
+`extDict` segment, and their offsets are therefore miscalculated when one is
+present. This can lead to data corruption.
+
+This diff clears the `dictCtx` whenever setting an `extDict`.
+
+This issue was uncovered by @terrelln's fuzzing work.
+---
+ lib/lz4hc.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/lib/lz4hc.c b/lib/lz4hc.c
+index b62e085..98813a6 100644
+--- a/lib/lz4hc.c
++++ b/lib/lz4hc.c
+@@ -940,6 +940,11 @@ static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBl
+     if (ctxPtr->end >= ctxPtr->base + ctxPtr->dictLimit + 4)
+         LZ4HC_Insert (ctxPtr, ctxPtr->end-3);   /* Referencing remaining dictionary content */
+ 
++    /* cannot reference an extDict and a dictCtx at the same time */
++    if (ctxPtr->dictCtx != NULL) {
++        ctxPtr->dictCtx = NULL;
++    }
++
+     /* Only one memory segment for extDict, so any previous extDict is lost at this stage */
+     ctxPtr->lowLimit  = ctxPtr->dictLimit;
+     ctxPtr->dictLimit = (U32)(ctxPtr->end - ctxPtr->base);
+-- 
+1.8.3.1
+

lz4.spec

@@ -1,17 +1,18 @@
 Name:           lz4
-Version:        1.9.4
+Version:        1.9.3
-Release:        2
+Release:        1
 Summary:        Extremely fast compression algorithm
 
 License:        GPLv2+ and BSD
 URL:            https://lz4.github.io/lz4/
 Source0:        https://github.com/lz4/lz4/archive/v%{version}/%{name}-%{version}.tar.gz
+Patch6000:		Fix-Data-Corruption-Bug-when-Streaming-with-an-Attac.patch
 
 Provides:       %{name}-libs = %{version}-%{release}
 Obsoletes:      %{name} < 1.7.5-3
 Obsoletes:      %{name}-libs
 
-BuildRequires:	gcc 
+BuildRequires:	gcc git
 
 %description
 LZ4 is lossless compression algorithm, providing compression speed > 500 MB/s per
@@ -32,19 +33,16 @@ applications using liblz4 library.
 %package_help
 
 %prep
-%autosetup -n %{name}-%{version} -p1
+%autosetup -n %{name}-%{version} -p1 -Sgit
 cp %{_builddir}/%{name}-%{version}/lib/LICENSE %{_builddir}/%{name}-%{version}/LICENSE-lib
 
 %build
-export MOREFLAGS="-g -D_FORTIFY_SOURCE=2 -O2"
+export MOREFLAGS="-g"
 %make_build
 
 %install
 %make_install LIBDIR=%{_libdir} PREFIX=%{_prefix}
 
-%check
-make check
-
 %post -p /sbin/ldconfig
 
 %postun -p /sbin/ldconfig
@@ -70,21 +68,6 @@ make check
 %{_mandir}/man1/unlz4.1*
 
 %changelog
-* Thu Feb 16 2023 zhangnan <zhangnan134@huawei.com> - 1.9.4-2
-- add make check in spec
-
-* Thu Jan 19 2023 Lv Ying <lvying6@huawei.com> - 1.9.4-1
-- upgrade to 1.9.4-1
-
-* Mon Jun 20 2022 renhongxun <renhongxun@h-partners.com> - 1.9.3-4
-- add _FORTIFY_SOURCE add enable check
-
-* Fri Jul 30 2021 chenyanpanHW <chenyanpan@huawei.com> - 1.9.3-3
-- DESC: delete -Sgit from %autosetup, and delete BuildRequires git
-
-* Sat Jun 19 2021 shixuantong <shixuantong@huawei.com> - 1.9.3-2 
-- fix CVE-2021-3520
-
 * Thu Jan 28 2021 liudabo <liudabo1@huawei.com> - 1.9.3-1
 - upgrade version to 1.9.3