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avcodec/rawdec: Use linesize in b64a

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Fixes: out of array access
Fixes: 19750/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RAWVIDEO_fuzzer-5074834119983104

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-01 22:32:04 +01:00
parent 8652f4e7a1
commit 2b5b9d5dac
1 changed files with 7 additions and 4 deletions
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11
libavcodec/rawdec.c
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@ -467,10 +467,13 @@ static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {
uint8_t *dst = frame->data[0];
uint64_t v;
int x;
for (x = 0; x >> 3 < avctx->width * avctx->height; x += 8) {
v = AV_RB64(&dst[x]);
AV_WB64(&dst[x], v << 16 | v >> 48);
int x, y;
for (y = 0; y < avctx->height; y++) {
for (x = 0; x >> 3 < avctx->width; x += 8) {
v = AV_RB64(&dst[x]);
AV_WB64(&dst[x], v << 16 | v >> 48);
}
dst += frame->linesize[0];
}
}