diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 6ffc9c4e93afb4efa27fe6f3c17fc3cdf41d8c21..6c6fbff19752ecbcf2d4822965ff6bb09d7ee656 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1970,7 +1970,8 @@ ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file,
 		   resp_size);
 	INIT_UDATA(&uhw, buf + sizeof(cmd),
 		   (unsigned long)cmd.response + resp_size,
-		   in_len - sizeof(cmd), out_len - resp_size);
+		   in_len - sizeof(cmd) - sizeof(struct ib_uverbs_cmd_hdr),
+		   out_len - resp_size);
 
 	memset(&cmd_ex, 0, sizeof(cmd_ex));
 	cmd_ex.user_handle = cmd.user_handle;
@@ -3413,7 +3414,8 @@ ssize_t ib_uverbs_create_srq(struct ib_uverbs_file *file,
 
 	INIT_UDATA(&udata, buf + sizeof cmd,
 		   (unsigned long) cmd.response + sizeof resp,
-		   in_len - sizeof cmd, out_len - sizeof resp);
+		   in_len - sizeof cmd - sizeof(struct ib_uverbs_cmd_hdr),
+		   out_len - sizeof resp);
 
 	ret = __uverbs_create_xsrq(file, ib_dev, &xcmd, &udata);
 	if (ret)
@@ -3439,7 +3441,8 @@ ssize_t ib_uverbs_create_xsrq(struct ib_uverbs_file *file,
 
 	INIT_UDATA(&udata, buf + sizeof cmd,
 		   (unsigned long) cmd.response + sizeof resp,
-		   in_len - sizeof cmd, out_len - sizeof resp);
+		   in_len - sizeof cmd - sizeof(struct ib_uverbs_cmd_hdr),
+		   out_len - sizeof resp);
 
 	ret = __uverbs_create_xsrq(file, ib_dev, &cmd, &udata);
 	if (ret)
diff --git a/drivers/infiniband/hw/mlx5/srq.c b/drivers/infiniband/hw/mlx5/srq.c
index a1b7122c2ad6fca225ed015d43da4e667a88c374..3b2ddd64a371689e1533cb08c23007a4d6016b03 100644
--- a/drivers/infiniband/hw/mlx5/srq.c
+++ b/drivers/infiniband/hw/mlx5/srq.c
@@ -88,13 +88,8 @@ static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
 	int ncont;
 	u32 offset;
 	u32 uidx = MLX5_IB_DEFAULT_UIDX;
-	int drv_data = udata->inlen - sizeof(struct ib_uverbs_cmd_hdr);
 
-	if (drv_data < 0)
-		return -EINVAL;
-
-	ucmdlen = (drv_data < sizeof(ucmd)) ?
-		  drv_data : sizeof(ucmd);
+	ucmdlen = min(udata->inlen, sizeof(ucmd));
 
 	if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
 		mlx5_ib_dbg(dev, "failed copy udata\n");
@@ -104,9 +99,9 @@ static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
 	if (ucmd.reserved0 || ucmd.reserved1)
 		return -EINVAL;
 
-	if (drv_data > sizeof(ucmd) &&
+	if (udata->inlen > sizeof(ucmd) &&
 	    !ib_is_udata_cleared(udata, sizeof(ucmd),
-				 drv_data - sizeof(ucmd)))
+				 udata->inlen - sizeof(ucmd)))
 		return -EINVAL;
 
 	if (is_xrc) {