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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2012-09-11 17:21:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-02 10:30:10 -0700 |
| commit | 87a34202d070db674e215091e98d21881af56f22 (patch) | |
| tree | 1508216f463095a288c32acf60d7b7b8cf7a3b29 /drivers/dma | |
| parent | 8dd47c73d93505aee90bc56d56965ef82b535f93 (diff) | |
| download | kernel-common-87a34202d070db674e215091e98d21881af56f22.tar.gz kernel-common-87a34202d070db674e215091e98d21881af56f22.tar.bz2 kernel-common-87a34202d070db674e215091e98d21881af56f22.zip | |
dmaengine: at_hdmac: check that each sg data length is non-null
commit c456797681db814f4f5b36909e8e94047bf53d9c upstream.
Avoid the construction of a malformed DMA request sent to
the DMA controller.
Log message is for debug only because this condition is unlikely to
append and may only trigger at driver development time.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/at_hdmac.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 6a089828d25f..9ec3943b1232 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -691,6 +691,11 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, mem = sg_dma_address(sg); len = sg_dma_len(sg); + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), + "prep_slave_sg: sg(%d) data length is zero\n", i); + goto err; + } mem_width = 2; if (unlikely(mem & 3 || len & 3)) mem_width = 0; @@ -726,6 +731,11 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, mem = sg_dma_address(sg); len = sg_dma_len(sg); + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), + "prep_slave_sg: sg(%d) data length is zero\n", i); + goto err; + } mem_width = 2; if (unlikely(mem & 3 || len & 3)) mem_width = 0; @@ -759,6 +769,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, err_desc_get: dev_err(chan2dev(chan), "not enough descriptors available\n"); +err: atc_desc_put(atchan, first); return NULL; } |