linux-kernel - [PATCH v3] usb: gadget: udc: remove pointer dereference after free

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Message-ID: <20170213225317.Horde.AFw31ZzUy8_Xlb1EKAA_9Ci@gator4166.hostgator.com>
Date:   Mon, 13 Feb 2017 22:53:17 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Michal Nazarewicz <mina86@...a86.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        gregkh@...uxfoundation.org, balbi@...nel.org,
        heikki.krogerus@...ux.intel.com, mail@...oabal.eu,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH v3] usb: gadget: udc: remove pointer dereference after free

Remove pointer dereference after free.

Addresses-Coverity-ID: 1091173
Acked-by: Michal Nazarewicz <mina86@...a86.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
Changes in v2:
  Move pointer dereference before pci_pool_free()
  Set pointer to NULL after free

Changes in v3:
  Remove 'td->next = 0x00' inside for loop.
  Remove unnecessary pointer nullification after free.

  drivers/usb/gadget/udc/pch_udc.c | 1 -
  1 file changed, 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/pch_udc.c  
b/drivers/usb/gadget/udc/pch_udc.c
index a97da64..8a365aa 100644
--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -1523,7 +1523,6 @@ static void pch_udc_free_dma_chain(struct  
pch_udc_dev *dev,
                 td = phys_to_virt(addr);
                 addr2 = (dma_addr_t)td->next;
                 pci_pool_free(dev->data_requests, td, addr);
-               td->next = 0x00;
                 addr = addr2;
         }
         req->chain_len = 1;
-- 
2.5.0