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dma: ste_dma40: Fix potential null pointer dereference

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kcalloc can return NULL. Check the pointer before dereferencing.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Sachin Kamat 2013-09-02 13:44:59 +05:30 committed by Vinod Koul
parent cbbe13ea09
commit 2ec7e2e7b5
1 changed files with 3 additions and 0 deletions
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drivers/dma/ste_dma40.c
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@ -2591,6 +2591,9 @@ dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
int i;
sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT);
if (!sg)
return NULL;
for (i = 0; i < periods; i++) {
sg_dma_address(&sg[i]) = dma_addr;
sg_dma_len(&sg[i]) = period_len;