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package/bzip2: add upstream security fix for CVE-2019-12900

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Patch to resolve cve-2019-12900 which affects bzip2 versions 1.0.6 and older

More information can be found at
https://nvd.nist.gov/vuln/detail/CVE-2019-12900

Signed-off-by: Jared Bents <jared.bents@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Jared Bents 2019-06-26 09:20:42 -05:00 committed by Peter Korsgaard
parent abc782c0b3
commit 6581c441df
1 changed files with 33 additions and 0 deletions
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33
package/bzip2/0003-Make-sure-nSelectors-is-not-out-of-range.patch Normal file
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@ -0,0 +1,33 @@
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
Signed-off-by: Albert Astals Cid <aacid@kde.org>
---
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) {
--
2.21.0