linux-kernel - [PATCH 3.16 070/148] usb: gadget: pch

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Date:   Sat, 08 Feb 2020 18:20:09 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Michal Nazarewicz" <mina86@...a86.com>
Subject: [PATCH 3.16 070/148] usb: gadget: pch_udc: fix use after free

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>

commit 66d1b0c0580b7f1b1850ee4423f32ac42afa2e92 upstream.

Remove pointer dereference after free.

pci_pool_free doesn't care about contents of td.
It's just a void* for it

Addresses-Coverity-ID: 1091173 ("Use after free")
Acked-by: Michal Nazarewicz <mina86@...a86.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Link: https://lore.kernel.org/r/20191106202821.GA20347@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/gadget/pch_udc.c | 1 -
 1 file changed, 1 deletion(-)

--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -1533,7 +1533,6 @@ static void pch_udc_free_dma_chain(struc
 		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;