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Staging: Eliminate a NULL pointer dereference

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Eliminate a NULL or near NULL pointer dereference.

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: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Julia Lawall 2010-05-27 14:37:19 +02:00 • committed by Greg Kroah-Hartman
commit c60e55f30a
2 changed files with 2 additions and 5 deletions
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3
drivers/staging/comedi/drivers/usbdux.c
View file

@ -351,8 +351,7 @@ static int usbdux_ai_stop(struct usbduxsub *this_usbduxsub, int do_unlink)
int ret = 0;
if (!this_usbduxsub) {
dev_err(&this_usbduxsub->interface->dev,
"comedi?: usbdux_ai_stop: this_usbduxsub=NULL!\n");
pr_err("comedi?: usbdux_ai_stop: this_usbduxsub=NULL!\n");
return -EFAULT;
}
dev_dbg(&this_usbduxsub->interface->dev, "comedi: usbdux_ai_stop\n");

4
drivers/staging/dt3155/allocator.c
View file

@ -176,9 +176,7 @@ int allocator_free_dma(unsigned long address)
prev = ptr; ptr = ptr->next;
if (!ptr) {
printk(KERN_ERR ALL_MSG
"free_dma(0x%08lx) but add. not allocated\n",
ptr->address);
pr_err(ALL_MSG "free_dma but add. not allocated\n");
return -EINVAL;
}
PDEBUGG("freeing: %08lx (%li) next %08lx\n", ptr->address, ptr->size,