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avcodec/huffyuvdec: Initialize whole output for decode_gray_bitstream()

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Fixes: use of uninitialized memory
Fixes: 375286238/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HYMT_fuzzer-6352546854141952

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2024-11-30 01:48:22 +01:00
parent aec2933344
commit ef71552cf9
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1 changed files with 2 additions and 0 deletions
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libavcodec/huffyuvdec.c
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@ -783,6 +783,8 @@ static void decode_gray_bitstream(HYuvDecContext *s, int count)
for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) { for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0); READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
} }
for (; i < count; i++)
s->temp[0][2 * i] = s->temp[0][2 * i + 1] = 0;
} else { } else {
for (i = 0; i < count; i++) { for (i = 0; i < count; i++) {
READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0); READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);