commit 2e7931c27eb15e387da440a37f12437e35b22dd4
Author: Erik de Castro Lopo <erikd@mega-nerd.com>
Date:   Mon Oct 7 12:55:58 2019 +1100

    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

diff --git a/src/libFLAC/bitreader.c b/src/libFLAC/bitreader.c
index 5e4b5918..3df4d02c 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);
 	}