Fix: Integer overflow and resultant buffer overflow via crafted input

Resolves: CVE-2021-43618

cve-2021-43618.patch

@@ -0,0 +1,25 @@
+
+# HG changeset patch
+# User Marco Bodrato <bodrato@mail.dm.unipi.it>
+# Date 1634836009 -7200
+# Node ID 561a9c25298e17bb01896801ff353546c6923dbd
+# Parent  e1fd9db13b475209a864577237ea4b9105b3e96e
+mpz/inp_raw.c: Avoid bit size overflows
+
+diff -r e1fd9db13b47 -r 561a9c25298e mpz/inp_raw.c
+--- a/mpz/inp_raw.c	Tue Dec 22 23:49:51 2020 +0100
++++ b/mpz/inp_raw.c	Thu Oct 21 19:06:49 2021 +0200
+@@ -88,8 +88,11 @@
+ 
+   abs_csize = ABS (csize);
+ 
++  if (UNLIKELY (abs_csize > ~(mp_bitcnt_t) 0 / 8))
++    return 0; /* Bit size overflows */
++
+   /* round up to a multiple of limbs */
+-  abs_xsize = BITS_TO_LIMBS (abs_csize*8);
++  abs_xsize = BITS_TO_LIMBS ((mp_bitcnt_t) abs_csize * 8);
+ 
+   if (abs_xsize != 0)
+     {
+

gmp.spec

@@ -6,7 +6,7 @@
 Summary: A GNU arbitrary precision library
 Name: gmp
 Version: 6.2.0
-Release: 10%{?dist}
+Release: 11%{?dist}
 Epoch: 1
 URL: http://gmplib.org/
 Source0: ftp://ftp.gmplib.org/pub/gmp-%{version}/gmp-%{version}.tar.bz2
@@ -15,6 +15,7 @@ Source2: gmp.h
 Source3: gmp-mparam.h
 Patch2: gmp-6.0.0-debuginfo.patch
 Patch3: gmp-intel-cet.patch
+Patch4: cve-2021-43618.patch
 License: LGPLv3+ or GPLv2+
 BuildRequires: autoconf automake libtool
 BuildRequires: gcc
@@ -182,6 +183,10 @@ export LD_LIBRARY_PATH=`pwd`/.libs
 %{_libdir}/libgmpxx.a
 
 %changelog
+* Tue Jun 06 2023 Jakub Martisko <jamartis@redhat.com> - 1:6.2.0-11
+Fix: Integer overflow and resultant buffer overflow via crafted input
+Resolves: CVE-2021-43618
+
 * Fri Aug 27 2021 Jakub Martisko <jamartis@redhat.com> - 1:6.2.0-10
 - Add the support for intel CET
 Resolves: rhbz#1977890