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avifMetaDestroy: check meta pointer before accessing #2065

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merged 4 commits into from
Mar 19, 2024
Merged

avifMetaDestroy: check meta pointer before accessing #2065

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0bb3916
avifMetaDestroy: check meta pointer before accessing
jzern Mar 18, 2024
3445b59
read.c: fix formatting
jzern Mar 18, 2024
8d8ed47
read.c: fix formatting x 2
jzern Mar 18, 2024
0ca98f2
read.c: relocate pointer check
jzern Mar 18, 2024
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4 changes: 4 additions & 0 deletions src/read.c
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Original file line number Diff line number Diff line change
Expand Up @@ -760,6 +760,10 @@ static avifMeta * avifMetaCreate()

static void avifMetaDestroy(avifMeta * meta)
{
if (meta == NULL) {
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The commit message should also acknowledge the person who ran nallocfuzz and reported this bug to us (Philippe Antoine).

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The commit message should also acknowledge the person who ran nallocfuzz and reported this bug to us (Philippe Antoine).

Found by Nallocfuzz (https://github.com/catenacyber/nallocfuzz).

This was the format I used in other projects, that was suggested by Philippe. I can add his name though.

return;
}
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Nit: The current style in src/read.c is to have the caller handle this. For example, see the second avifMetaDestroy() call in avifDecoderDataDestroy():

static void avifDecoderDataDestroy(avifDecoderData * data)
{
    avifMetaDestroy(data->meta);
    for (uint32_t i = 0; i < data->tracks.count; ++i) {
        avifTrack * track = &data->tracks.track[i];
        if (track->sampleTable) {
            avifSampleTableDestroy(track->sampleTable);
        }
        if (track->meta) {
            avifMetaDestroy(track->meta);
        }
    }
    avifArrayDestroy(&data->tracks);
    avifDecoderDataClearTiles(data);
    avifArrayDestroy(&data->tiles);
    avifFree(data);
}

So I suggest adding a similar null pointer check to the first avifMetaDestroy() call in avifDecoderDataDestroy().

    if (data->meta) {
        avifMetaDestroy(data->meta);
    }

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Nit: The current style in src/read.c is to have the caller handle this. For example, see the second avifMetaDestroy() call in avifDecoderDataDestroy():

static void avifDecoderDataDestroy(avifDecoderData * data)
{
    avifMetaDestroy(data->meta);
    for (uint32_t i = 0; i < data->tracks.count; ++i) {
        avifTrack * track = &data->tracks.track[i];
        if (track->sampleTable) {
            avifSampleTableDestroy(track->sampleTable);
        }
        if (track->meta) {
            avifMetaDestroy(track->meta);
        }
    }
    avifArrayDestroy(&data->tracks);
    avifDecoderDataClearTiles(data);
    avifArrayDestroy(&data->tiles);
    avifFree(data);
}

So I suggest adding a similar null pointer check to the first avifMetaDestroy() call in avifDecoderDataDestroy().

    if (data->meta) {
        avifMetaDestroy(data->meta);
    }

Done


for (uint32_t i = 0; i < meta->items.count; ++i) {
avifDecoderItem * item = meta->items.item[i];
avifArrayDestroy(&item->properties);
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