Fixes out of bounds access in BZ2_decompress

Resolves: RHEL-64929

bzip2.spec

@@ -3,7 +3,7 @@
 Summary: A file compression utility
 Name: bzip2
 Version: 1.0.6
-Release: 26%{?dist}
+Release: 27%{?dist}
 License: BSD
 Group: Applications/File
 URL: http://www.bzip.org/
@@ -17,6 +17,7 @@ Patch2: bzip2-1.0.4-bzip2recover.patch
 Patch3: bzip2-ldflags.patch
 # resolves: #1348179
 Patch4: set-out-file-to-null.patch
+Patch5: decompress-out-of-bounds.patch
 
 %description
 Bzip2 is a freely available, patent-free, high quality data compressor.
@@ -62,6 +63,7 @@ Static libraries for applications using the bzip2 compression format.
 %patch2 -p1 -b .bz2recover
 %patch3 -p1 -b .ldflags
 %patch4 -p1 -b .bzip2recover
+%patch5 -p1
 
 cp -a %{SOURCE1} .
 sed -i "s|^libdir=|libdir=%{_libdir}|" bzip2.pc
@@ -140,6 +142,9 @@ ln -s bzgrep.1 $RPM_BUILD_ROOT%{_mandir}/man1/bzfgrep.1
 %{_libdir}/pkgconfig/bzip2.pc
 
 %changelog
+* Tue Oct 29 2024 Jacek Migacz <jmigacz@redhat.com> - 1.0.6-27
+- Fixes out of bounds access in BZ2_decompress (RHEL-64929)
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1.0.6-26
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
 

decompress-out-of-bounds.patch

@@ -0,0 +1,13 @@
+diff --git a/decompress.c b/decompress.c
+index ab6a624db17a1c124b5be09c04b0e99d950b70ff..f3db91d14f6ed09f76fbd5c73f7db2cba5f577da 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 > 6) 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) {