File libFLAC-bitreader.c-Fix-out-of-bounds-read.patch of Package flac.17690

From 2e7931c27eb15e387da440a37f12437e35b22dd4 Mon Sep 17 00:00:00 2001
From: Erik de Castro Lopo <erikd@mega-nerd.com>
Date: Mon, 7 Oct 2019 12:55:58 +1100
Subject: [PATCH] libFLAC/bitreader.c: Fix out-of-bounds read

Credit: Oss-Fuzz
Issue: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17069
Testcase: fuzzer_decoder-5670265022840832
---
 src/libFLAC/bitreader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libFLAC/bitreader.c b/src/libFLAC/bitreader.c
index 5e4b59180eb3..3df4d02c0bb0 100644
--- a/src/libFLAC/bitreader.c
+++ b/src/libFLAC/bitreader.c
@@ -869,7 +869,7 @@ incomplete_lsbs:
 			cwords = br->consumed_words;
 			words = br->words;
 			ucbits = FLAC__BITS_PER_WORD - br->consumed_bits;
-			b = br->buffer[cwords] << br->consumed_bits;
+			b = cwords < br->capacity ? br->buffer[cwords] << br->consumed_bits : 0;
 		} while(cwords >= words && val < end);
 	}
 
-- 
2.26.2