bzip2: Fix CVE-2019-12900

Added patch for CVE-2019-12900 as backport from upstream.
Fixes out of bound access discovered while fuzzying karchive.

Tested by: Sana.Kazi@kpit.com

(From OE-Core rev: aec10c9993f04304466e15ea7a5bc4d85a357c5b)

Signed-off-by: Saloni Jain <Saloni.Jain@kpit.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/bzip2/bzip2-1.0.6/CVE-2019-12900.patch

@@ -0,0 +1,36 @@
+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
+
+Link: https://gitlab.com/federicomenaquintero/bzip2/commit/74de1e2e6ffc9d51ef9824db71a8ffee5962cdbc.patch
+
+Upstream-Status: Backport
+CVE: CVE-2019-12900.patch
+Signed-off-by: Saloni Jain <Saloni.Jain@kpit.com>
+---
+ 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 > 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) {
+--
+2.22.0