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dmaengine: dw-axi-dmac: fix null dereference when pointer first is null

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[ Upstream commit 0788611c9a ]

In the unlikely event that axi_desc_get returns a null desc in the
very first iteration of the while-loop the error exit path ends
up calling axi_desc_put on a null pointer 'first' and this causes
a null pointer dereference.  Fix this by adding a null check on
pointer 'first' before calling axi_desc_put.

Addresses-Coverity: ("Explicit null dereference")
Fixes: 1fe20f1b84 ("dmaengine: Introduce DW AXI DMAC driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Colin Ian King 2019-05-08 23:33:29 +01:00 committed by Greg Kroah-Hartman
parent 4c21b761b4
commit e478abd4eb
1 changed files with 2 additions and 1 deletions
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3
drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
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@ -512,7 +512,8 @@ dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr,
return vchan_tx_prep(&chan->vc, &first->vd, flags);
err_desc_get:
axi_desc_put(first);
if (first)
axi_desc_put(first);
return NULL;
}