linux-kernel - [PATCH 5.4 034/144] spi: spi-pic32: Fix issue with uninitialized dma_slave

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Date:   Mon, 13 Sep 2021 15:13:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Purna Chandra Mandal <purna.mandal@...rochip.com>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 034/144] spi: spi-pic32: Fix issue with uninitialized dma_slave_config

From: Tony Lindgren <tony@...mide.com>

[ Upstream commit 976c1de1de147bb7f4e0d87482f375221c05aeaf ]

Depending on the DMA driver being used, the struct dma_slave_config may
need to be initialized to zero for the unused data.

For example, we have three DMA drivers using src_port_window_size and
dst_port_window_size. If these are left uninitialized, it can cause DMA
failures.

For spi-pic32, this is probably not currently an issue but is still good to
fix though.

Fixes: 1bcb9f8ceb67 ("spi: spi-pic32: Add PIC32 SPI master driver")
Cc: Purna Chandra Mandal <purna.mandal@...rochip.com>
Cc: Peter Ujfalusi <peter.ujfalusi@...il.com>
Cc: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Link: https://lore.kernel.org/r/20210810081727.19491-2-tony@atomide.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-pic32.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-pic32.c b/drivers/spi/spi-pic32.c
index 8272bde5d706..b5268b0d7b4c 100644
--- a/drivers/spi/spi-pic32.c
+++ b/drivers/spi/spi-pic32.c
@@ -361,6 +361,7 @@ static int pic32_spi_dma_config(struct pic32_spi *pic32s, u32 dma_width)
 	struct dma_slave_config cfg;
 	int ret;
 
+	memset(&cfg, 0, sizeof(cfg));
 	cfg.device_fc = true;
 	cfg.src_addr = pic32s->dma_base + buf_offset;
 	cfg.dst_addr = pic32s->dma_base + buf_offset;
-- 
2.30.2