From 2e7931c27eb15e387da440a37f12437e35b22dd4 Mon Sep 17 00:00:00 2001 From: Erik de Castro Lopo 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 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); }