dm->nxblocks = (w + dm->blockx/2 - 1) / (dm->blockx/2);
dm->nyblocks = (h + dm->blocky/2 - 1) / (dm->blocky/2);
dm->bdiffsize = dm->nxblocks * dm->nyblocks;
- dm->bdiffs = av_malloc(dm->bdiffsize * sizeof(*dm->bdiffs));
+ dm->bdiffs = av_malloc_array(dm->bdiffsize, sizeof(*dm->bdiffs));
dm->queue = av_calloc(dm->cycle, sizeof(*dm->queue));
if (!dm->bdiffs || !dm->queue)