diff --git a/drivers/misc/misc_decompress.c b/drivers/misc/misc_decompress.c
index 6188135846..4cce52b838 100644
--- a/drivers/misc/misc_decompress.c
+++ b/drivers/misc/misc_decompress.c
@@ -90,8 +90,10 @@ int misc_decompress_start(struct udevice *dev, unsigned long dst,
 		return -EPERM;
 	}
 
-	param.size_src = misc_get_data_size(src, src_len, param.mode);
-	if (!param.size_src)
+	param.size_src = src_len;
+	param.size_dst = misc_get_data_size(src, src_len, param.mode);
+
+	if (!param.size_src || !param.size_dst)
 		return -EINVAL;
 
 	return misc_ioctl(dev, IOCTL_REQ_START, &param);
diff --git a/drivers/misc/rockchip_decompress.c b/drivers/misc/rockchip_decompress.c
index 6a15b2d0de..b9ad3c4a3e 100644
--- a/drivers/misc/rockchip_decompress.c
+++ b/drivers/misc/rockchip_decompress.c
@@ -92,8 +92,8 @@ static int rockchip_decom_start(struct udevice *dev, void *buf)
 {
 	struct rockchip_decom_priv *priv = dev_get_priv(dev);
 	struct decom_param *param = (struct decom_param *)buf;
-	unsigned int limit_lo = param->size_src & 0xffffffff;
-	unsigned int limit_hi = param->size_src >> 32;
+	unsigned int limit_lo = param->size_dst & 0xffffffff;
+	unsigned int limit_hi = param->size_dst >> 32;
 	ulong align_input, align_len;
 
 #if CONFIG_IS_ENABLED(DM_RESET)
diff --git a/include/misc.h b/include/misc.h
index ac91fc09da..501148dc56 100644
--- a/include/misc.h
+++ b/include/misc.h
@@ -150,8 +150,8 @@ int misc_otp_write(struct udevice *dev, int offset, const void *buf, int size);
 struct decom_param {
 	unsigned long addr_src;
 	unsigned long addr_dst;
-	u64 size_src;
-	u64 size_dst;	/* to be filled for output */
+	u64 size_src;	/* compressed */
+	u64 size_dst;	/* decompressed, to be filled for output */
 	enum misc_mode mode;
 };