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);

 	}