misc: rtsx_usb: use separate command and response buffers

rtsx_usb uses same buffer for command and response. There could
be a potential conflict using the same buffer for both especially
if retries and timeouts are involved.

Use separate command and response buffers to avoid conflicts.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/07e3721804ff07aaab9ef5b39a5691d0718b9ade.1656642167.git.skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/cardreader/rtsx_usb.c b/drivers/misc/cardreader/rtsx_usb.c
index e147cc8..4e21080 100644 (file)
--- a/drivers/misc/cardreader/rtsx_usb.c
+++ b/drivers/misc/cardreader/rtsx_usb.c
@@ -631,15 +631,18 @@ static int rtsx_usb_probe(struct usb_interface *intf,
 
        ucr->pusb_dev = usb_dev;
 
-       ucr->iobuf = kmalloc(IOBUF_SIZE, GFP_KERNEL);
-       if (!ucr->iobuf)
+       ucr->cmd_buf = kmalloc(IOBUF_SIZE, GFP_KERNEL);
+       if (!ucr->cmd_buf)
                return -ENOMEM;
 
+       ucr->rsp_buf = kmalloc(IOBUF_SIZE, GFP_KERNEL);
+       if (!ucr->rsp_buf)
+               goto out_free_cmd_buf;
+
        usb_set_intfdata(intf, ucr);
 
        ucr->vendor_id = id->idVendor;
        ucr->product_id = id->idProduct;
-       ucr->cmd_buf = ucr->rsp_buf = ucr->iobuf;
 
        mutex_init(&ucr->dev_mutex);
 
@@ -667,9 +670,11 @@ static int rtsx_usb_probe(struct usb_interface *intf,
 
 out_init_fail:
        usb_set_intfdata(ucr->pusb_intf, NULL);
-       kfree(ucr->iobuf);
-       ucr->iobuf = NULL;
-       ucr->cmd_buf = ucr->rsp_buf = NULL;
+       kfree(ucr->rsp_buf);
+       ucr->rsp_buf = NULL;
+out_free_cmd_buf:
+       kfree(ucr->cmd_buf);
+       ucr->cmd_buf = NULL;
        return ret;
 }
 
@@ -682,9 +687,12 @@ static void rtsx_usb_disconnect(struct usb_interface *intf)
        mfd_remove_devices(&intf->dev);
 
        usb_set_intfdata(ucr->pusb_intf, NULL);
-       kfree(ucr->iobuf);
-       ucr->iobuf = NULL;
-       ucr->cmd_buf = ucr->rsp_buf = NULL;
+
+       kfree(ucr->cmd_buf);
+       ucr->cmd_buf = NULL;
+
+       kfree(ucr->rsp_buf);
+       ucr->rsp_buf = NULL;
 }
 
 #ifdef CONFIG_PM

diff --git a/include/linux/rtsx_usb.h b/include/linux/rtsx_usb.h
index a07f734..3247ed8 100644 (file)
--- a/include/linux/rtsx_usb.h
+++ b/include/linux/rtsx_usb.h
@@ -54,7 +54,6 @@ struct rtsx_ucr {
        struct usb_device       *pusb_dev;
        struct usb_interface    *pusb_intf;
        struct usb_sg_request   current_sg;
-       unsigned char           *iobuf;
 
        struct timer_list       sg_timer;
        struct mutex            dev_mutex;