From 99f1a43f436a6a92d15bddfeb65f3a920c8b88d3 Mon Sep 17 00:00:00 2001
From: Scott Ellis <scott@jumpnowtek.com>
Date: Mon, 24 May 2010 14:20:27 +0000
Subject: [PATCH] spi/omap2_mcspi: Check params before dereference or use
Check spi->chip_select for range before use.
Signed-off-by: Scott Ellis <scott@jumpnowtek.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---
drivers/spi/omap2_mcspi.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index 6df85537bd19..b3a94ca0a75a 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -834,7 +834,6 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
struct omap2_mcspi_cs *cs;
mcspi = spi_master_get_devdata(spi->master);
- mcspi_dma = &mcspi->dma_channels[spi->chip_select];
if (spi->controller_state) {
/* Unlink controller state from context save list */
@@ -844,13 +843,17 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
kfree(spi->controller_state);
}
- if (mcspi_dma->dma_rx_channel != -1) {
- omap_free_dma(mcspi_dma->dma_rx_channel);
- mcspi_dma->dma_rx_channel = -1;
- }
- if (mcspi_dma->dma_tx_channel != -1) {
- omap_free_dma(mcspi_dma->dma_tx_channel);
- mcspi_dma->dma_tx_channel = -1;
+ if (spi->chip_select < spi->master->num_chipselect) {
+ mcspi_dma = &mcspi->dma_channels[spi->chip_select];
+
+ if (mcspi_dma->dma_rx_channel != -1) {
+ omap_free_dma(mcspi_dma->dma_rx_channel);
+ mcspi_dma->dma_rx_channel = -1;
+ }
+ if (mcspi_dma->dma_tx_channel != -1) {
+ omap_free_dma(mcspi_dma->dma_tx_channel);
+ mcspi_dma->dma_tx_channel = -1;
+ }
}
}
--
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