After used bitmap freeng s->used_bmap points to the freed memory. If we try to free used bitmap one more time it leads to double free error.
Set s->used_bmap to NULL to exclude double free error. Signed-off-by: Alexander Ivanov <alexander.iva...@virtuozzo.com> Reviewed-by: Denis V. Lunev <d...@openvz.org> --- block/parallels.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/parallels.c b/block/parallels.c index 9205a0864f..072b1efd78 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -245,6 +245,7 @@ static void parallels_free_used_bitmap(BlockDriverState *bs) BDRVParallelsState *s = bs->opaque; s->used_bmap_size = 0; g_free(s->used_bmap); + s->used_bmap = NULL; } static int64_t coroutine_fn GRAPH_RDLOCK -- 2.40.1