dmaengine: at_hdmac: check that each sg data length is non-null

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>
Cc: Stable <stable@vger.kernel.org> [2.6.31+]
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 6c09e18..7ab6e26 100644 (file)
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -689,6 +689,11 @@ 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;
@@ -724,6 +729,11 @@ 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;
@@ -757,6 +767,7 @@ 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;
 }