linux-kernel - [PATCH 4.19 002/140] usb: gadget: pch

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Message-Id: <20191216174748.287062615@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:47:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michal Nazarewicz <mina86@...a86.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH 4.19 002/140] usb: gadget: pch_udc: fix use after free

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")
Cc: stable@...r.kernel.org
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>

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

--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -1520,7 +1520,6 @@ static void pch_udc_free_dma_chain(struc
 		td = phys_to_virt(addr);
 		addr2 = (dma_addr_t)td->next;
 		dma_pool_free(dev->data_requests, td, addr);
-		td->next = 0x00;
 		addr = addr2;
 	}
 	req->chain_len = 1;