nvme: Reduce get-reg command memory allocation size

Reduce the size to the register offset to get.

Signed-off-by: Tokunori Ikegami <[email protected]>

nvme.c

@@ -5410,7 +5410,8 @@ bool nvme_is_fabrics_reg(int offset)
 
 static int get_register_property(int fd, void **pbar, int offset)
 {
-	int err, size = getpagesize();
+	int err;
+	int size = offset + 1 + nvme_is_64bit_reg(offset) ? sizeof(uint64_t) : sizeof(uint32_t);
 	__u64 value;
 	void *bar = malloc(size);
 	struct nvme_get_property_args args = {