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-rw-r--r--block.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/block.c b/block.c
index 510430de35..0143268279 100644
--- a/block.c
+++ b/block.c
@@ -3054,8 +3054,20 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num),
align >> BDRV_SECTOR_BITS);
if (max_nb_sectors > 0) {
- ret = drv->bdrv_co_readv(bs, sector_num,
- MIN(nb_sectors, max_nb_sectors), qiov);
+ QEMUIOVector local_qiov;
+ size_t local_sectors;
+
+ max_nb_sectors = MIN(max_nb_sectors, SIZE_MAX / BDRV_SECTOR_BITS);
+ local_sectors = MIN(max_nb_sectors, nb_sectors);
+
+ qemu_iovec_init(&local_qiov, qiov->niov);
+ qemu_iovec_concat(&local_qiov, qiov, 0,
+ local_sectors * BDRV_SECTOR_SIZE);
+
+ ret = drv->bdrv_co_readv(bs, sector_num, local_sectors,
+ &local_qiov);
+
+ qemu_iovec_destroy(&local_qiov);
} else {
ret = 0;
}