linux-kernel - [PATCH] staging: vchiq_arm: cast with _

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Message-Id: <20200519004531.33158-1-tasman@leaflabs.com>
Date:   Mon, 18 May 2020 20:45:31 -0400
From:   Mitchell Tasman <tasman@...flabs.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jamal Shareef <jamal.k.shareef@...il.com>,
        Marcelo Diop-Gonzalez <marcgonzalez@...gle.com>,
        Nishka Dasgupta <nishkadg.linux@...il.com>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, Mitchell Tasman <tasman@...flabs.com>
Subject: [PATCH] staging: vchiq_arm: cast with __force as needed

In several cases where a pointer marked as __user is
(intentionally) assigned or passed to a non-marked target,
cast to the target pointer type with a __force directive
to quiet warnings from sparse.

Signed-off-by: Mitchell Tasman <tasman@...flabs.com>
---
 .../vc04_services/interface/vchiq_arm/vchiq_2835_arm.c     | 7 ++++---
 .../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c  | 4 +++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
index c18c6ca0b6c0..38a13e4618a8 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -371,14 +371,15 @@ create_pagelist(char __user *buf, size_t count, unsigned short type)
 	pagelistinfo->scatterlist = scatterlist;
 	pagelistinfo->scatterlist_mapped = 0;
 
-	if (is_vmalloc_addr(buf)) {
+	if (is_vmalloc_addr((void __force *)buf)) {
 		unsigned long length = count;
 		unsigned int off = offset;
 
 		for (actual_pages = 0; actual_pages < num_pages;
 		     actual_pages++) {
-			struct page *pg = vmalloc_to_page(buf + (actual_pages *
-								 PAGE_SIZE));
+			struct page *pg =
+				vmalloc_to_page((void __force *)(buf +
+						 (actual_pages * PAGE_SIZE)));
 			size_t bytes = PAGE_SIZE - off;
 
 			if (!pg) {
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index 2d3e114f4a66..28ea8c3a4cba 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -1209,7 +1209,9 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 					/* The completion must point to the
 					** msgbuf. */
-					completion->header = msgbuf;
+					completion->header =
+						(struct vchiq_header __force *)
+						msgbuf;
 				}
 
 				if ((completion->reason ==
-- 
2.17.1