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Prevent heap overflow in channel-pair reconstruction #217

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Merged
fabiangreffrath merged 1 commit into from
Mar 25, 2026
Merged

Prevent heap overflow in channel-pair reconstruction #217

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32 changes: 20 additions & 12 deletions libfaad/specrec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -847,27 +847,35 @@ static uint8_t allocate_channel_pair(NeAACDecStruct *hDecoder,
}
#endif
}
if (hDecoder->time_out[channel] == NULL)
if (hDecoder->time_out[channel] != NULL)
{
hDecoder->time_out[channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->time_out[channel], 0, mul*hDecoder->frameLength*sizeof(real_t));
faad_free(hDecoder->time_out[channel]);
hDecoder->time_out[channel] = NULL;
}
if (hDecoder->time_out[paired_channel] == NULL)
if (hDecoder->time_out[paired_channel] != NULL)
{
hDecoder->time_out[paired_channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->time_out[paired_channel], 0, mul*hDecoder->frameLength*sizeof(real_t));
faad_free(hDecoder->time_out[paired_channel]);
hDecoder->time_out[paired_channel] = NULL;
}
hDecoder->time_out[channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->time_out[channel], 0, mul*hDecoder->frameLength*sizeof(real_t));
hDecoder->time_out[paired_channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->time_out[paired_channel], 0, mul*hDecoder->frameLength*sizeof(real_t));

if (hDecoder->fb_intermed[channel] == NULL)
if (hDecoder->fb_intermed[channel] != NULL)
{
hDecoder->fb_intermed[channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->fb_intermed[channel], 0, hDecoder->frameLength*sizeof(real_t));
faad_free(hDecoder->fb_intermed[channel]);
hDecoder->fb_intermed[channel] = NULL;
}
if (hDecoder->fb_intermed[paired_channel] == NULL)
if (hDecoder->fb_intermed[paired_channel] != NULL)
{
hDecoder->fb_intermed[paired_channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->fb_intermed[paired_channel], 0, hDecoder->frameLength*sizeof(real_t));
faad_free(hDecoder->fb_intermed[paired_channel]);
hDecoder->fb_intermed[paired_channel] = NULL;
}
hDecoder->fb_intermed[channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->fb_intermed[channel], 0, hDecoder->frameLength*sizeof(real_t));
hDecoder->fb_intermed[paired_channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
memset(hDecoder->fb_intermed[paired_channel], 0, hDecoder->frameLength*sizeof(real_t));

#ifdef SSR_DEC
if (hDecoder->object_type == SSR)
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