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8e40d78a05
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@ -1,38 +0,0 @@
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From 2c67902d594f7ae37b68cef1692b823b4b497e92 Mon Sep 17 00:00:00 2001
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From: "W. Felix Handte" <w@felixhandte.com>
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Date: Thu, 18 Jul 2019 12:41:12 -0400
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Subject: [PATCH 3/3] Fix Data Corruption Bug when Streaming with an Attached
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Dict in HC Mode
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This diff fixes an issue in which we failed to clear the `dictCtx` in HC
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compression. The `dictCtx` is not supposed to be used when an `extDict` is
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present: matches found in the `dictCtx` do not account for the presence of an
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`extDict` segment, and their offsets are therefore miscalculated when one is
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present. This can lead to data corruption.
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This diff clears the `dictCtx` whenever setting an `extDict`.
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This issue was uncovered by @terrelln's fuzzing work.
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---
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lib/lz4hc.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/lib/lz4hc.c b/lib/lz4hc.c
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index b62e085..98813a6 100644
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--- a/lib/lz4hc.c
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+++ b/lib/lz4hc.c
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@@ -940,6 +940,11 @@ static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBl
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if (ctxPtr->end >= ctxPtr->base + ctxPtr->dictLimit + 4)
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LZ4HC_Insert (ctxPtr, ctxPtr->end-3); /* Referencing remaining dictionary content */
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+ /* cannot reference an extDict and a dictCtx at the same time */
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+ if (ctxPtr->dictCtx != NULL) {
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+ ctxPtr->dictCtx = NULL;
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+ }
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+
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/* Only one memory segment for extDict, so any previous extDict is lost at this stage */
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ctxPtr->lowLimit = ctxPtr->dictLimit;
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ctxPtr->dictLimit = (U32)(ctxPtr->end - ctxPtr->base);
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--
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1.8.3.1
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BIN
lz4-1.9.3.tar.gz
BIN
lz4-1.9.3.tar.gz
Binary file not shown.
BIN
lz4-1.9.4.tar.gz
Normal file
BIN
lz4-1.9.4.tar.gz
Normal file
Binary file not shown.
29
lz4.spec
29
lz4.spec
@ -1,18 +1,17 @@
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Name: lz4
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Version: 1.9.3
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Release: 1
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Version: 1.9.4
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Release: 2
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Summary: Extremely fast compression algorithm
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License: GPLv2+ and BSD
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URL: https://lz4.github.io/lz4/
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Source0: https://github.com/lz4/lz4/archive/v%{version}/%{name}-%{version}.tar.gz
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Patch6000: Fix-Data-Corruption-Bug-when-Streaming-with-an-Attac.patch
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Provides: %{name}-libs = %{version}-%{release}
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Obsoletes: %{name} < 1.7.5-3
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Obsoletes: %{name}-libs
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BuildRequires: gcc git
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BuildRequires: gcc
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%description
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LZ4 is lossless compression algorithm, providing compression speed > 500 MB/s per
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@ -33,16 +32,19 @@ applications using liblz4 library.
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%package_help
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%prep
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%autosetup -n %{name}-%{version} -p1 -Sgit
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%autosetup -n %{name}-%{version} -p1
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cp %{_builddir}/%{name}-%{version}/lib/LICENSE %{_builddir}/%{name}-%{version}/LICENSE-lib
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%build
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export MOREFLAGS="-g"
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export MOREFLAGS="-g -D_FORTIFY_SOURCE=2 -O2"
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%make_build
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%install
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%make_install LIBDIR=%{_libdir} PREFIX=%{_prefix}
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%check
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make check
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%post -p /sbin/ldconfig
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%postun -p /sbin/ldconfig
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@ -68,6 +70,21 @@ export MOREFLAGS="-g"
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%{_mandir}/man1/unlz4.1*
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%changelog
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* Thu Feb 16 2023 zhangnan <zhangnan134@huawei.com> - 1.9.4-2
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- add make check in spec
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* Thu Jan 19 2023 Lv Ying <lvying6@huawei.com> - 1.9.4-1
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- upgrade to 1.9.4-1
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* Mon Jun 20 2022 renhongxun <renhongxun@h-partners.com> - 1.9.3-4
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- add _FORTIFY_SOURCE add enable check
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* Fri Jul 30 2021 chenyanpanHW <chenyanpan@huawei.com> - 1.9.3-3
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- DESC: delete -Sgit from %autosetup, and delete BuildRequires git
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* Sat Jun 19 2021 shixuantong <shixuantong@huawei.com> - 1.9.3-2
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- fix CVE-2021-3520
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* Thu Jan 28 2021 liudabo <liudabo1@huawei.com> - 1.9.3-1
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- upgrade version to 1.9.3
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