linux-ext4 - Re: [PATCH 18/49] misc: fix header complaints and resource leaks in e2fsprogs

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Date:	Fri, 14 Mar 2014 09:39:31 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 18/49] misc: fix header complaints and resource leaks in
 e2fsprogs

On Mon, Mar 10, 2014 at 11:55:53PM -0700, Darrick J. Wong wrote:
> diff --git a/e2fsck/unix.c b/e2fsck/unix.c
> index b39383d..11c2693 100644
> --- a/e2fsck/unix.c
> +++ b/e2fsck/unix.c
> @@ -1016,6 +1016,7 @@ static errcode_t PRS(int argc, char *argv[], e2fsck_t *ret_ctx)
>  			strcat(newpath, oldpath);
>  		}
>  		putenv(newpath);
> +		free(newpath);
>  	}

This introduces a bug.  An attempt to reference the PATH environment
variable will result in garbage or a crash.  Quoting from the putenv()
manpage:

   The putenv() function adds or changes the value of environment
   variables.  The argument string is of the form name=value.  If name
   does not already exist in the environment, then string is added to
   the environment.  If name does exist, then the value of name in the
   environment is changed to value.  The string pointed to by string
   becomes part of the environment, so altering the string changes the
   environment.

It's a common false positive with things like cppcheck, valgrind
--leak-check, etc.

Cheers,

						- Ted
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