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Add INT64_MAX limit to seekpoints

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FLAC seekpoints are coded in unsigned 64-bit ints, but the code
handling them uses signed 64-bit ints. Since users are unlikely
to run into this limit anyway, do not use seekpoints larger than
INT64_MAX

Credit: Oss-Fuzz
Issue: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48112
This commit is contained in:
Martijn van Beurden 2022-06-29 09:14:29 +02:00
parent cee5a1dcd3
commit 10c0a5f610
1 changed files with 5 additions and 2 deletions
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7
src/libFLAC/stream_decoder.c
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@ -3283,7 +3283,9 @@ FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 s
* must be ordered by ascending sample number.
*
* Note: to protect against invalid seek tables we will ignore points
* that have frame_samples==0 or sample_number>=total_samples
* that have frame_samples==0 or sample_number>=total_samples. Also,
* because math is limited to 64-bit ints, seekpoints with an offset
* larger than 2^63 (8 exbibyte) are rejected.
*/
if(seek_table) {
FLAC__uint64 new_lower_bound = lower_bound;
@ -3312,7 +3314,8 @@ FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 s
seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
(total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
seek_table->points[i].sample_number > target_sample
seek_table->points[i].sample_number > target_sample &&
seek_table->points[i].stream_offset < (FLAC__uint64)INT64_MAX
)
break;
}