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authorScott Ellis <scott@jumpnowtek.com>2010-03-11 00:22:45 +0300
committerGrant Likely <grant.likely@secretlab.ca>2010-03-11 00:22:45 +0300
commit5e7749436d576a525d7b2a4bcffb17b3364b9e00 (patch)
tree1c7e0c67f0e5cdc49f594afd65204d09a3a8a017 /drivers/spi
parent07081fd8587478849b69d7b41596e81ff5a7f532 (diff)
downloadlinux-5e7749436d576a525d7b2a4bcffb17b3364b9e00.tar.xz
spi/omap2_mcspi: fix NULL pointer dereference
Check spi->controller_state before dereferencing. Shows up NULL here when using spi_alloc_device()/spi_add_device() and spi_add_device() fails before spi_setup(). Calling spi_dev_put() on the leftover spi_device results in the error. Signed-off-by: Scott Ellis <scott@jumpnowtek.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/omap2_mcspi.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index 715c518b1b68..87d44eeaaa7b 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -751,11 +751,13 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
mcspi = spi_master_get_devdata(spi->master);
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
- /* Unlink controller state from context save list */
- cs = spi->controller_state;
- list_del(&cs->node);
+ if (spi->controller_state) {
+ /* Unlink controller state from context save list */
+ cs = spi->controller_state;
+ list_del(&cs->node);
- kfree(spi->controller_state);
+ kfree(spi->controller_state);
+ }
if (mcspi_dma->dma_rx_channel != -1) {
omap_free_dma(mcspi_dma->dma_rx_channel);