From 581a895c5c8b464a7fc7ebbaa6d9f565c10bae62 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 25 Sep 2019 20:31:50 +0200 Subject: avcodec/alsdec: Avoid dereferencing context pointer in inner interleave loop This makes the decoder faster Improves/Fixes: Timeout (22sec -> 20sec) Testcase: 17619/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5078510820917248 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Paul B Mahol Signed-off-by: Michael Niedermayer --- libavcodec/alsdec.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'libavcodec/alsdec.c') diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index a53c170d18..56313d206c 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -1815,15 +1815,17 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, #define INTERLEAVE_OUTPUT(bps) \ { \ int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \ + int channels = avctx->channels; \ + int32_t **raw_samples = ctx->raw_samples; \ shift = bps - ctx->avctx->bits_per_raw_sample; \ if (!ctx->cs_switch) { \ for (sample = 0; sample < ctx->cur_frame_length; sample++) \ - for (c = 0; c < avctx->channels; c++) \ - *dest++ = ctx->raw_samples[c][sample] * (1U << shift); \ + for (c = 0; c < channels; c++) \ + *dest++ = raw_samples[c][sample] * (1U << shift); \ } else { \ for (sample = 0; sample < ctx->cur_frame_length; sample++) \ - for (c = 0; c < avctx->channels; c++) \ - *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] * (1U << shift); \ + for (c = 0; c < channels; c++) \ + *dest++ = raw_samples[sconf->chan_pos[c]][sample] * (1U << shift);\ } \ } -- cgit v1.2.3