linux-kernel - New Defect(s) reported by Coverity Scan

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Date:	Wed, 22 Aug 2012 22:00:10 +0000
From:	Scan Subscription <scan-subscription@...erity.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: New Defect(s) reported by Coverity Scan


Hi,

Please find the latest report on new defect(s) that have been introduced to the Linux Kernel found with Coverity SCAN. 


Defect(s) Reported-by: Coverity Scan:
___________________________________________________________________________
** CID 716812: Unchecked return value (CHECKED_RETURN)
/drivers/platform/x86/ideapad-laptop.c: 639
http://scan5.coverity.com:8080/sourcebrowser.htm?projectId=10063#mergedDefectId=716812


** CID 715732: Macro compares unsigned to 0 (NO_EFFECT)
/drivers/gpu/drm/nouveau/nve0_fifo.c: 307
http://scan5.coverity.com:8080/sourcebrowser.htm?projectId=10063#mergedDefectId=715732


** CID 715543: Dereference before null check (REVERSE_INULL)
/drivers/input/touchscreen/eeti_ts.c: 209
http://scan5.coverity.com:8080/sourcebrowser.htm?projectId=10063#mergedDefectId=715543



###########################################################################
Defect Details:
___________________________________________________________________________
CID 716812: Unchecked return value (CHECKED_RETURN)
http://scan5.coverity.com:8080/sourcebrowser.htm?projectId=10063#mergedDefectId=716812

/drivers/platform/x86/ideapad-laptop.c: 639 ( check_return)
   636    {
   637    	unsigned long bit, value;
   638    
>>> CID 716812: Unchecked return value (CHECKED_RETURN) Calling function 
>>> "read_ec_data(acpi_handle, int, unsigned long *)" without checking return value (as is done elsewhere 23 out of 25 times).
>>> No check of the return value of "read_ec_data(ideapad_handle, 49, &value)".
   639    	read_ec_data(ideapad_handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
   640    
   641    	for (bit = 0; bit < 16; bit++) {
   642    		if (test_bit(bit, &value)) {
   643    			switch (bit) {
  
 
________________________________________________________________________
CID 715732: Macro compares unsigned to 0 (NO_EFFECT)
http://scan5.coverity.com:8080/sourcebrowser.htm?projectId=10063#mergedDefectId=715732

/drivers/gpu/drm/nouveau/nve0_fifo.c: 307 ( unsigned_compare)
   304    	int ret = -EINVAL;
   305    
   306    	spin_lock_irqsave(&dev_priv->channels.lock, flags);
>>> CID 715732: Macro compares unsigned to 0 (NO_EFFECT) This 
>>> greater-than-or-equal-to-zero comparison of an unsigned value is always true. "chid >= 0U".
   307    	if (likely(chid >= 0 && chid < priv->base.channels)) {
   308    		chan = dev_priv->channels.ptr[chid];
   309    		if (likely(chan))
   310    			ret = nouveau_finish_page_flip(chan, NULL);
   311    	}
  
________________________________________________________________________
CID 715543: Dereference before null check (REVERSE_INULL)
http://scan5.coverity.com:8080/sourcebrowser.htm?projectId=10063#mergedDefectId=715543

/drivers/input/touchscreen/eeti_ts.c: 202 ( deref_ptr)
   199    
   200    	priv->client = client;
   201    	priv->input = input;
>>> Directly dereferencing pointer "pdata".
   202    	priv->irq_gpio = pdata->irq_gpio;
   203    	priv->irq = gpio_to_irq(pdata->irq_gpio);
   204    
   205    	err = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
   206    	if (err < 0)
   207    		goto err1;
   208    
>>> CID 715543: Dereference before null check (REVERSE_INULL) 
>>> Null-checking "pdata" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
   209    	if (pdata)
   210    		priv->irq_active_high = pdata->irq_active_high;
   211    
   212    	irq_flags = priv->irq_active_high ?
   213    		IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
  
________________________________________________________________________


To view the defects in Coverity Scan visit, http://scan5.coverity.com:8080.  
Your username should be the first part of your email address. If you don't have a username, you can request one by emailing: scan-admin@...erity.com
	
Thank you,
Dakshesh Vyas
Coverity SCAN-ADMIN
scan-admin@...erity.com
http://scan.coverity.com

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