[PATCH 4.9 253/264] xprtrdma: fix incorrect header size calculations

[Greg Kroah-Hartman]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

commit 912288442cb2f431bf3c8cb097a5de83bc6dbac1 upstream.

Currently the header size calculations are using an assignment
operator instead of a += operator when accumulating the header
size leading to incorrect sizes.  Fix this by using the correct
operator.

Addresses-Coverity: ("Unused value")
Fixes: 302d3deb2068 ("xprtrdma: Prevent inline overflow")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Reviewed-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/sunrpc/xprtrdma/rpc_rdma.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -75,7 +75,7 @@ static unsigned int rpcrdma_max_call_hea
 
 	/* Maximum Read list size */
 	maxsegs += 2;	/* segment for head and tail buffers */
-	size = maxsegs * sizeof(struct rpcrdma_read_chunk);
+	size += maxsegs * sizeof(struct rpcrdma_read_chunk);
 
 	/* Minimal Read chunk size */
 	size += sizeof(__be32);	/* segment count */
@@ -101,7 +101,7 @@ static unsigned int rpcrdma_max_reply_he
 
 	/* Maximum Write list size */
 	maxsegs += 2;	/* segment for head and tail buffers */
-	size = sizeof(__be32);		/* segment count */
+	size += sizeof(__be32);		/* segment count */
 	size += maxsegs * sizeof(struct rpcrdma_segment);
 	size += sizeof(__be32);	/* list discriminator */