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authorJingchang Lu <b35083@freescale.com>2014-02-21 10:50:06 +0400
committerVinod Koul <vinod.koul@intel.com>2014-03-06 19:13:57 +0400
commit178c81e58e91559fd2c6b1cae43c8f573a2ead36 (patch)
tree82f08ee72646dfd319c34021abe008544adafc9e /drivers/dma/fsl-edma.c
parent7cbccb55f04bef306bc2840185ec8f986bd0df3c (diff)
downloadlinux-178c81e58e91559fd2c6b1cae43c8f573a2ead36.tar.xz
dma: fsl-edma: fix static checker warning of NULL dereference
The static checker reports following warning: drivers/dma/fsl-edma.c:732 fsl_edma_xlate() error: we previously assumed 'chan' could be null (see line 737) The changes of the loop cursor in the iteration may result in NULL dereference when dma_get_slave_channel failed but loop will continue. So use list_for_each_entry_safe() instead of list_for_each_entry() to against this. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jingchang Lu <b35083@freescale.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/fsl-edma.c')
-rw-r--r--drivers/dma/fsl-edma.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 9025300a1670..381e793184ba 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -723,13 +723,13 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
- struct dma_chan *chan;
+ struct dma_chan *chan, *_chan;
if (dma_spec->args_count != 2)
return NULL;
mutex_lock(&fsl_edma->fsl_edma_mutex);
- list_for_each_entry(chan, &fsl_edma->dma_dev.channels, device_node) {
+ list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
if (chan->client_count)
continue;
if ((chan->chan_id / DMAMUX_NR) == dma_spec->args[0]) {