From: "Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>
Upstream commit 829ca44ecf60e9b6f83d0161a6ef10c1304c5060.
[Apply to 4.9.x]
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.
So, replace the following form:
sizeof(*pkt) + sizeof(pkt->addr[0])*n
with:
struct_size(pkt, addr, n)
Also, notice that variable size is unnecessary, hence it is removed.
This code was detected with the help of Coccinelle.
Backport notes:
- required include of linux/overflow.h
Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
drivers/infiniband/hw/qib/qib_user_sdma.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c
index 3e0677c..deef6ff 100644
--- a/drivers/infiniband/hw/qib/qib_user_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
@@ -41,6 +41,7 @@
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
+#include <linux/overflow.h>
#include "qib.h"
#include "qib_user_sdma.h"
@@ -908,10 +909,11 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
}
if (frag_size) {
- int pktsize, tidsmsize, n;
+ int tidsmsize, n;
+ size_t pktsize;
n = npages*((2*PAGE_SIZE/frag_size)+1);
- pktsize = sizeof(*pkt) + sizeof(pkt->addr[0])*n;
+ pktsize = struct_size(pkt, addr, n);
/*
* Determine if this is tid-sdma or just sdma.
--
1.8.3.1
