linux-kernel - Re: fs/hugetlbfs/inode.c:1467 hugetlb_file_setup() error: potentially dereferencing uninitialized 'ucounts'.

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Message-ID: <5a0b1b12-9ed3-530d-4b8b-69332208f580@oracle.com>
Date:   Fri, 5 Nov 2021 09:47:31 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>, kbuild@...ts.01.org,
        zhangyiru <zhangyiru3@...wei.com>
Cc:     lkp@...el.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: fs/hugetlbfs/inode.c:1467 hugetlb_file_setup() error: potentially
 dereferencing uninitialized 'ucounts'.

On 11/5/21 6:27 AM, Dan Carpenter wrote:
> tree:   https://github.com/0day-ci/linux/commits/UPDATE-20211101-211012/zhangyiru/mm-hugetlb-remove-mlock-ulimit-for-SHM_HUGETLB/20211009-094538
> head:   52edddc18d9541ad72912b32edd74baacc94d504
> commit: 52edddc18d9541ad72912b32edd74baacc94d504 mm,hugetlb: remove mlock ulimit for SHM_HUGETLB
> config: i386-randconfig-m021-20211101 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> New smatch warnings:
> fs/hugetlbfs/inode.c:1467 hugetlb_file_setup() error: potentially dereferencing uninitialized 'ucounts'.
> 
> Old smatch warnings:
> fs/hugetlbfs/inode.c:1498 hugetlb_file_setup() error: potentially dereferencing uninitialized 'ucounts'.
> 
> vim +/ucounts +1467 fs/hugetlbfs/inode.c

Thanks Dan,

There is an updated version of this patch in Andrew's tree that should
address this issue.
-- 
Mike Kravetz