NetBSD Problem Report #42654

From www@NetBSD.org  Wed Jan 20 20:36:56 2010
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Date: Wed, 20 Jan 2010 20:36:55 +0000 (UTC)
From: joel.sherrill@gmail.com
Reply-To: joel.sherrill@gmail.com
To: gnats-bugs@NetBSD.org
Subject: Coverity Scan Issues on ls.c
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>Number:         42654
>Category:       bin
>Synopsis:       Coverity Scan Issues on ls.c
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 20 20:40:00 +0000 2010
>Last-Modified:  Thu Jan 28 19:00:04 +0000 2010
>Originator:     Joel Sherrill
>Release:        NA
>Organization:
RTEMS (http:://www.rtems.org
>Environment:
NA
>Description:
The RTEMS Project is using some code pulled in from NetBSD.  We are also part of the Coverity Scan project for free software projects.  We have two Coverity "results" on ls.c CVS id 1.58 which are reported as dead code. I compared that version against the head (20 Jan 2010) and these issues do not look fixed. Looking at the code, I am completely unsure of the intent but both look like bugs.

I can provide full versions of the Coverity Scan logs via email and am happy to rerun if provided fixes.  We just need someone more familiar with the code to help fix these two.  T

Please. :)
>How-To-Repeat:
This is a fragment of one of the reports.  Sorry if the cut and paste does not look nice.

Event dead_error_condition: On this path, the condition "flags != 0" could not be true
Event const: After this line, the value of "flags" is equal to 0
Event new_values: Conditional "flags != 0"
Also see events: [dead_error_begin][const][const][assignment][new_values]

630  					 if (f_flags && flags) {

Event dead_error_begin: Cannot reach dead code beginning here
Also see events: [dead_error_condition][const][const][assignment][new_values]

631  						np->flags = &np->data[ulen + glen + 2];
632  					  	(void)strcpy(np->flags, flags);

>Fix:
Unknown

>Audit-Trail:
From: Alan Barrett <apb@cequrux.com>
To: gnats-bugs@NetBSD.org
Cc: netbsd-bugs@NetBSD.org
Subject: Re: bin/42654: Coverity Scan Issues on ls.c
Date: Thu, 28 Jan 2010 20:19:02 +0200

 On Wed, 20 Jan 2010, joel.sherrill@gmail.com wrote:
 > The RTEMS Project is using some code pulled in from NetBSD.  We are
 > also part of the Coverity Scan project for free software projects.  We
 > have two Coverity "results" on ls.c CVS id 1.58 which are reported as
 > dead code. [...]

 > 630  					 if (f_flags && flags) {

 This line does not appear in revision 1.58 of NetBSD's src/bin/ls/ls.c.

 > 631  						np->flags = &np->data[ulen + glen + 2];
 > 632  					  	(void)strcpy(np->flags, flags);

 Lines with content like this do appear, as lines 570 and 571 of revision
 1.58 of NetBSD's src/bin/ls/ls.c.  However, the fact that the line
 numbers are different indicates that the file you checked is not the
 file from NetBSD.  It's not at all clear, from what you have told us so
 far, that your Coverity report applies to NetBSD's version of ls.c.

 --apb (Alan Barrett)

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