Staging: Eliminate a NULL pointer dereference
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>
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@ -351,8 +351,7 @@ static int usbdux_ai_stop(struct usbduxsub *this_usbduxsub, int do_unlink)
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int ret = 0;
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if (!this_usbduxsub) {
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dev_err(&this_usbduxsub->interface->dev,
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"comedi?: usbdux_ai_stop: this_usbduxsub=NULL!\n");
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pr_err("comedi?: usbdux_ai_stop: this_usbduxsub=NULL!\n");
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return -EFAULT;
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}
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dev_dbg(&this_usbduxsub->interface->dev, "comedi: usbdux_ai_stop\n");
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@ -176,9 +176,7 @@ int allocator_free_dma(unsigned long address)
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prev = ptr; ptr = ptr->next;
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if (!ptr) {
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printk(KERN_ERR ALL_MSG
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"free_dma(0x%08lx) but add. not allocated\n",
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ptr->address);
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pr_err(ALL_MSG "free_dma but add. not allocated\n");
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return -EINVAL;
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}
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PDEBUGG("freeing: %08lx (%li) next %08lx\n", ptr->address, ptr->size,
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