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-rw-r--r--block/qcow2.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index e22f6dc0c6..7cfcd8412c 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2491,6 +2491,11 @@ static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs,
int ret;
BDRVQcow2State *s = bs->opaque;
+ if (!QEMU_IS_ALIGNED(offset | count, s->cluster_size)) {
+ assert(count < s->cluster_size);
+ return -ENOTSUP;
+ }
+
qemu_co_mutex_lock(&s->lock);
ret = qcow2_discard_clusters(bs, offset, count >> BDRV_SECTOR_BITS,
QCOW2_DISCARD_REQUEST, false);