From 97a5addfcf0029d0f5538ed70cb38cae4108a618 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 14 Apr 2012 11:07:11 +0200 Subject: [PATCH] wmaprodec: check num_vec_coeffs for validity Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer --- libavcodec/wmaprodec.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c index 665b33c922..419523590b 100644 --- a/libavcodec/wmaprodec.c +++ b/libavcodec/wmaprodec.c @@ -1169,7 +1169,12 @@ static int decode_subframe(WMAProDecodeCtx *s) int num_bits = av_log2((s->subframe_len + 3)/4) + 1; for (i = 0; i < s->channels_for_cur_subframe; i++) { int c = s->channel_indexes_for_cur_subframe[i]; - s->channel[c].num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; + int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; + if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) { + av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs); + return AVERROR_INVALIDDATA; + } + s->channel[c].num_vec_coeffs = num_vec_coeffs; } } else { for (i = 0; i < s->channels_for_cur_subframe; i++) {