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avcodec/jpegxl_parser: add some icc profile checks

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This patch will cause the parser to abort if it detects an icc profile
with an invalid size. This is particularly important if the icc profile
is entropy-encoded with zero bits per symbol, as it can prevent a
seemingly infinite loop during parsing.

Fixes: infinite loop
Fixes: 62374/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer
    -5551878085410816

Found-by: continuous fuzzing process
    https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reported-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Leo Izen <leo.izen@gmail.com>
This commit is contained in:
Leo Izen 2023-10-03 13:38:25 -04:00
parent d2d3a83ad9
commit ec74553205
No known key found for this signature in database
GPG Key ID: 5A71C331FD2FA19A
1 changed files with 35 additions and 9 deletions
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44
libavcodec/jpegxl_parser.c
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@ -1044,34 +1044,60 @@ static int skip_icc_profile(void *avctx, JXLParseContext *ctx, GetBitContext *gb
{
int64_t ret;
uint32_t last = 0, last2 = 0;
JXLEntropyDecoder dec;
JXLEntropyDecoder dec = { 0 };
uint64_t enc_size = jxl_u64(gb);
uint64_t output_size = 0;
int out_size_shift = 0;
if (!enc_size)
if (!enc_size || enc_size > (1 << 22))
return AVERROR_INVALIDDATA;
ret = entropy_decoder_init(avctx, gb, &dec, 41);
if (ret < 0)
return ret;
goto end;
if (get_bits_left(gb) < 0) {
entropy_decoder_close(&dec);
return AVERROR_BUFFER_TOO_SMALL;
ret = AVERROR_BUFFER_TOO_SMALL;
goto end;
}
for (uint64_t read = 0; read < enc_size; read++) {
ret = entropy_decoder_read_symbol(gb, &dec, icc_context(read, last, last2));
if (ret < 0 || get_bits_left(gb) < 0) {
entropy_decoder_close(&dec);
return ret < 0 ? ret : AVERROR_BUFFER_TOO_SMALL;
if (ret < 0)
goto end;
if (ret > 255) {
ret = AVERROR_INVALIDDATA;
goto end;
}
if (get_bits_left(gb) < 0) {
ret = AVERROR_BUFFER_TOO_SMALL;
goto end;
}
last2 = last;
last = ret;
if (out_size_shift < 63) {
output_size += (ret & UINT64_C(0x7F)) << out_size_shift;
if (!(ret & 0x80)) {
out_size_shift = 63;
} else {
out_size_shift += 7;
if (out_size_shift > 56) {
ret = AVERROR_INVALIDDATA;
goto end;
}
}
} else if (output_size < 132) {
ret = AVERROR_INVALIDDATA;
goto end;
}
}
ret = 0;
end:
entropy_decoder_close(&dec);
return 0;
return ret;
}
static int skip_extensions(GetBitContext *gb)