Fix: out of bound write in bz2_decompress

Resolves: RHEL-65201

bzip2-out_of_bounds.patch

@@ -0,0 +1,32 @@
+From 74de1e2e6ffc9d51ef9824db71a8ffee5962cdbc Mon Sep 17 00:00:00 2001
+From: Albert Astals Cid <aacid@kde.org>
+Date: Tue, 28 May 2019 19:35:18 +0200
+Subject: [PATCH] Make sure nSelectors is not out of range
+
+nSelectors is used in a loop from 0 to nSelectors to access selectorMtf
+which is
+	UChar    selectorMtf[BZ_MAX_SELECTORS];
+so if nSelectors is bigger than BZ_MAX_SELECTORS it'll do an invalid memory
+access
+
+Fixes out of bounds access discovered while fuzzying karchive
+---
+ decompress.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/decompress.c b/decompress.c
+index ab6a624..f3db91d 100644
+--- a/decompress.c
++++ b/decompress.c
+@@ -287,7 +287,7 @@ Int32 BZ2_decompress ( DState* s )
+       GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
+       if (nGroups < 2 || nGroups > BZ_N_GROUPS) RETURN(BZ_DATA_ERROR);
+       GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
+-      if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
++      if (nSelectors < 1 || nSelectors > BZ_MAX_SELECTORS) RETURN(BZ_DATA_ERROR);
+       for (i = 0; i < nSelectors; i++) {
+          j = 0;
+          while (True) {
+-- 
+GitLab
+

bzip2.spec

@@ -3,7 +3,7 @@
 Summary: File compression utility
 Name: bzip2
 Version: 1.0.8
-Release: 22%{?dist}
+Release: 23%{?dist}
 License: BSD-4-Clause
 URL: https://sourceware.org/bzip2
 #Source0: http://www.bzip.org/%{version}/%{name}-%{version}.tar.gz
@@ -19,6 +19,7 @@ Patch0: bzip2-saneso.patch
 Patch1: bzip2-cflags.patch
 Patch2: bzip2-ldflags.patch
 Patch3: man_gzipdiff.patch
+Patch4: bzip2-out_of_bounds.patch
 
 BuildRequires: gcc
 BuildRequires: make
@@ -63,6 +64,7 @@ Static libraries for applications using the bzip2 compression format.
 %patch 1 -p1
 %patch 2 -p1
 %patch 3 -p2
+%patch 4 -p1
 
 cp -a %{SOURCE1} .
 sed -i "s|^libdir=|libdir=%{_libdir}|" bzip2.pc
@@ -129,6 +131,10 @@ ln -s bzgrep.1 $RPM_BUILD_ROOT%{_mandir}/man1/bzfgrep.1
 %{_libdir}/pkgconfig/bzip2.pc
 
 %changelog
+* Tue Dec 03 2024 Jakub Martisko <jamartis@redhat.com> - 1.0.8-23
+- Fix out of bounds write in bz_decompress
+Resolves: CVE-2019-12900
+
 * Tue Dec 03 2024 Jakub Martisko <jamartis@redhat.com> - 1.0.8-22
 - Minor spec cleanup
 - Add explicit requires for the bzip2 package