From 11e1fac27eb8a3076382200736874c78e09b75d6 Mon Sep 17 00:00:00 2001 From: Albert Astals Cid 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 CVE: CVE-2019-12900 Upstream-Status: Backport Signed-off-by: Anuj Mittal --- decompress.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/decompress.c b/decompress.c index 311f566..b6e0a29 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) {