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Fix T81193 EEVEE: Crash when motion blur is aborted at cache finish 

This was caused by a use after free. The issue was that the motion steps
were successfully gathered but failling the last vertex count check,
discarding the copied VBOs but not removing the reference of the first
VBO which was passing the test.
This commit is contained in:
Clément Foucault 2021-01-30 16:56:38 +01:00
parent 3a954af862
commit 38bb263422
1 changed files with 18 additions and 6 deletions
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24
source/blender/draw/engines/eevee/eevee_motion_blur.c
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@ -376,6 +376,19 @@ void EEVEE_motion_blur_cache_populate(EEVEE_ViewLayerData *UNUSED(sldata),
}
}
static void motion_blur_remove_vbo_reference_from_batch(GPUBatch *batch,
GPUVertBuf *vbo1,
GPUVertBuf *vbo2)
{
for (int i = 0; i < GPU_BATCH_VBO_MAX_LEN; i++) {
if (ELEM(batch->verts[i], vbo1, vbo2)) {
/* Avoid double reference of the VBOs. */
batch->verts[i] = NULL;
}
}
}
void EEVEE_motion_blur_cache_finish(EEVEE_Data *vedata)
{
EEVEE_StorageList *stl = vedata->stl;
@ -446,6 +459,9 @@ void EEVEE_motion_blur_cache_finish(EEVEE_Data *vedata)
}
if (mb_geom->use_deform == false) {
motion_blur_remove_vbo_reference_from_batch(
batch, mb_geom->vbo[MB_PREV], mb_geom->vbo[MB_NEXT]);
GPU_VERTBUF_DISCARD_SAFE(mb_geom->vbo[MB_PREV]);
GPU_VERTBUF_DISCARD_SAFE(mb_geom->vbo[MB_NEXT]);
break;
@ -523,12 +539,8 @@ void EEVEE_motion_blur_swap_data(EEVEE_Data *vedata)
case EEVEE_MOTION_DATA_MESH:
if (mb_geom->batch != NULL) {
for (int i = 0; i < GPU_BATCH_VBO_MAX_LEN; i++) {
if (ELEM(mb_geom->batch->verts[i], mb_geom->vbo[MB_PREV], mb_geom->vbo[MB_NEXT])) {
/* Avoid double reference of the VBOs. */
mb_geom->batch->verts[i] = NULL;
}
}
motion_blur_remove_vbo_reference_from_batch(
mb_geom->batch, mb_geom->vbo[MB_PREV], mb_geom->vbo[MB_NEXT]);
}
GPU_VERTBUF_DISCARD_SAFE(mb_geom->vbo[MB_PREV]);
mb_geom->vbo[MB_PREV] = mb_geom->vbo[MB_NEXT];