linux-kernel - [PATCH] habanalabs: use u64_to_user

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Message-Id: <20190617124150.989515-1-arnd@arndb.de>
Date:   Mon, 17 Jun 2019 14:41:33 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Oded Gabbay <oded.gabbay@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dalit Ben Zoor <dbenzoor@...ana.ai>,
        Tomer Tayar <ttayar@...ana.ai>, linux-kernel@...r.kernel.org
Subject: [PATCH] habanalabs: use u64_to_user_ptr() for reading user pointers

We cannot cast a 64-bit integer to a pointer on 32-bit architectures
without a warning:

drivers/misc/habanalabs/habanalabs_ioctl.c: In function 'debug_coresight':
drivers/misc/habanalabs/habanalabs_ioctl.c:143:23: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   input = memdup_user((const void __user *) args->input_ptr,

Use the macro that was defined for this purpose.

Fixes: 315bc055ed56 ("habanalabs: add new IOCTL for debug, tracing and profiling")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/misc/habanalabs/habanalabs_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/habanalabs_ioctl.c b/drivers/misc/habanalabs/habanalabs_ioctl.c
index eeefb22023e9..b7a0eecf6b6c 100644
--- a/drivers/misc/habanalabs/habanalabs_ioctl.c
+++ b/drivers/misc/habanalabs/habanalabs_ioctl.c
@@ -140,7 +140,7 @@ static int debug_coresight(struct hl_device *hdev, struct hl_debug_args *args)
 	params->op = args->op;
 
 	if (args->input_ptr && args->input_size) {
-		input = memdup_user((const void __user *) args->input_ptr,
+		input = memdup_user(u64_to_user_ptr(args->input_ptr),
 					args->input_size);
 		if (IS_ERR(input)) {
 			rc = PTR_ERR(input);
-- 
2.20.0