From: Sachin Kamat <sachin.kamat@linaro.org>
Date: Mon, 2 Sep 2013 08:14:59 +0000 (+0530)
Subject: dma: ste_dma40: Fix potential null pointer dereference
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2ec7e2e7b5f41a09264abc6dbcfd3fdc9a1edfd5;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

dma: ste_dma40: Fix potential null pointer dereference

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>
---

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index df0a60656a8b..82d2b97ad942 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -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;