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avcodec/mimic: carry the pinned block grid across frame threads

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Fixes: heap-buffer-overflow write
Fixes: F3EGBYxEoA9T
Fixes: ANT-2026-A02CF8FP
Found-by: Anthropic using Claude, verified by Ada Logics
This commit is contained in:
Michael Niedermayer authored and michaelni committed 2026-09-28 03:41:46 +00:00
1 parent abad70c575
commit 01ce3d4d4f
1 file changed
+6
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libavcodec/mimic.c
+6
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@@ -152,6 +152,12 @@ static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCod
dst->cur_index = src->next_cur_index;
dst->prev_index = src->next_prev_index;
if (src->avctx) {
dst->avctx = avctx;
memcpy(dst->num_vblocks, src->num_vblocks, sizeof(dst->num_vblocks));
memcpy(dst->num_hblocks, src->num_hblocks, sizeof(dst->num_hblocks));
}
for (int i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) {
ff_progress_frame_unref(&dst->frames[i]);
if (i != src->next_cur_index && src->frames[i].f)