linux-kernel - [PATCH] dmaengine: pl330: Fix overflow when reporting residue in memcpy

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Message-id: <1434356716-32726-1-git-send-email-k.kozlowski@samsung.com>
Date:	Mon, 15 Jun 2015 17:25:16 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	stable@...r.kernel.org
Subject: [PATCH] dmaengine: pl330: Fix overflow when reporting residue in memcpy

During memcpy operations the residue was always set to an u32 overflowed
value.

In pl330_tx_status() function number of currently transferred bytes was
subtracted from internal "bytes_requested" field. However this
"bytes_requested" was not initialized at start to length of memcpy
buffer so transferred bytes were subtracted from 0 causing overflow.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: <stable@...r.kernel.org>
Fixes: aee4d1fac887 ("dmaengine: pl330: improve pl330_tx_status() function")
---
 drivers/dma/pl330.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index f513f77b1d85..c535cd059724 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2623,6 +2623,7 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 		desc->rqcfg.brst_len = 1;
 
 	desc->rqcfg.brst_len = get_burst_len(desc, len);
+	desc->bytes_requested = len;
 
 	desc->txd.flags = flags;
 
-- 
1.9.1

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