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alistair23-linux
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drivers/dma: Eliminate a NULL pointer dereference 

If td_desc is NULL, just skip both kfrees.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@

if ((E == NULL && ...) || ...)
{
  ... when != if (...) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
hifive-unleashed-5.1
Julia Lawall 2010-05-27 14:33:17 +02:00 committed by Dan Williams
parent efcc289817
commit 4856800501
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/timb_dma.c
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@ -382,7 +382,7 @@ static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan)
td_desc = kzalloc(sizeof(struct timb_dma_desc), GFP_KERNEL);
if (!td_desc) {
dev_err(chan2dev(chan), "Failed to alloc descriptor\n");
goto err;
goto out;
}
td_desc->desc_list_len = td_chan->desc_elems * TIMB_DMA_DESC_SIZE;
@ -410,7 +410,7 @@ static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan)
err:
kfree(td_desc->desc_list);
kfree(td_desc);
out:
return NULL;
}