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| author | Colin Ian King <colin.king@canonical.com> | 2019-05-09 01:33:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-25 06:34:47 +0300 |
| commit | 09167890636f32760cc6f90cb8e701cc85b16c3f (patch) | |
| tree | 1a713261bf26eb6be9a3b919bcba5ecbfccdc25c /drivers/dma | |
| parent | 4bd19c830b31676d854b24d967727618d47417e0 (diff) | |
| download | linux-09167890636f32760cc6f90cb8e701cc85b16c3f.tar.xz | |
dmaengine: dw-axi-dmac: fix null dereference when pointer first is null
[ Upstream commit 0788611c9a0925c607de536b2449de5ed98ef8df ]
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>
Signed-off-by: Sasha Levin <sashal@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; } |