[PATCH] ksmbd: Use struct_size() to improve smb_direct_rdma_xmit()

[Thorsten Blum <thorsten.blum@linux.dev>]

Use struct_size() to calculate the number of bytes to allocate for a
new message.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 fs/smb/server/transport_rdma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/smb/server/transport_rdma.c b/fs/smb/server/transport_rdma.c
index 44c87e300c16..17c76713c6d0 100644
--- a/fs/smb/server/transport_rdma.c
+++ b/fs/smb/server/transport_rdma.c
@@ -1405,8 +1405,8 @@ static int smb_direct_rdma_xmit(struct smb_direct_transport *t,
 	/* build rdma_rw_ctx for each descriptor */
 	desc_buf = buf;
 	for (i = 0; i < desc_num; i++) {
-		msg = kzalloc(offsetof(struct smb_direct_rdma_rw_msg, sg_list) +
-			      sizeof(struct scatterlist) * SG_CHUNK_SIZE, GFP_KERNEL);
+		msg = kzalloc(struct_size(msg, sg_list, SG_CHUNK_SIZE),
+			      GFP_KERNEL);
 		if (!msg) {
 			ret = -ENOMEM;
 			goto out;
-- 
2.46.1