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arch/mn10300/mm: eliminate NULL dereference

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dev_name always dereferences its argument, so it should not be called if
the argument is NULL.  The function indeed later tests the argument for
being NULL.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

  // <smpl>
  @@
  expression dev,E;
  @@

  *dev_name(dev)
  ... when != dev = E
  (
  *dev == NULL
  |
  *dev != NULL
  )
  // </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Julia Lawall 2010-08-23 14:31:34 +01:00 committed by Linus Torvalds
parent dc4c26bfed
commit 6e0c64f4dd
1 changed files with 2 additions and 1 deletions
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3
arch/mn10300/mm/dma-alloc.c
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@ -25,7 +25,8 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
unsigned long addr;
void *ret;
printk("dma_alloc_coherent(%s,%zu,,%x)\n", dev_name(dev), size, gfp);
pr_debug("dma_alloc_coherent(%s,%zu,%x)\n",
dev ? dev_name(dev) : "?", size, gfp);
if (0xbe000000 - pci_sram_allocated >= size) {
size = (size + 255) & ~255;