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| author | Colin Ian King <colin.king@canonical.com> | 2019-05-09 00:33:29 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-05-21 10:55:52 +0200 |
| commit | 0788611c9a0925c607de536b2449de5ed98ef8df (patch) | |
| tree | c26111be9939a5b470fbce3a359aba2823de99e2 /drivers/dma | |
| parent | dmaengine: fsl-qdma: Add improvement (diff) | |
| download | linux-0788611c9a0925c607de536b2449de5ed98ef8df.tar.xz linux-0788611c9a0925c607de536b2449de5ed98ef8df.zip | |
dmaengine: dw-axi-dmac: fix null dereference when pointer first is null
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: 1fe20f1b8454 ("dmaengine: Introduce DW AXI DMAC driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c index b2ac1d2c5b86..a1ce307c502f 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -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; } |