Re: [PATCH v2] ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY

[kernel test robot <lkp@intel.com>]

Hi tejas,

kernel test robot noticed the following build errors:

[auto build test ERROR on brauner-vfs/vfs.all]
[also build test ERROR on linus/master v6.16-rc1]
[cannot apply to next-20260403]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/tejas-bharambe/ocfs2-fix-use-after-free-in-ocfs2_fault-when-VM_FAULT_RETRY/20260403-161805
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all
patch link:    https://lore.kernel.org/r/JH0PR06MB66325344CF84BBC38B2973C38950A%40JH0PR06MB6632.apcprd06.prod.outlook.com
patch subject: [PATCH v2] ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY
config: x86_64-rhel-9.4-func (https://download.01.org/0day-ci/archive/20260403/202604031948.fsuptUtV-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260403/202604031948.fsuptUtV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604031948.fsuptUtV-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   fs/ocfs2/mmap.c: In function 'ocfs2_fault':
>> fs/ocfs2/mmap.c:41:35: error: 'inode' undeclared (first use in this function)
      41 |         trace_ocfs2_fault(OCFS2_I(inode)->ip_blkno,
         |                                   ^~~~~
   fs/ocfs2/mmap.c:41:35: note: each undeclared identifier is reported only once for each function it appears in
>> fs/ocfs2/mmap.c:33:32: warning: unused variable 'vma' [-Wunused-variable]
      33 |         struct vm_area_struct *vma = vmf->vma;
         |                                ^~~


vim +/inode +41 fs/ocfs2/mmap.c

    29	
    30	
    31	static vm_fault_t ocfs2_fault(struct vm_fault *vmf)
    32	{
  > 33		struct vm_area_struct *vma = vmf->vma;
    34		sigset_t oldset;
    35		vm_fault_t ret;
    36	
    37		ocfs2_block_signals(&oldset);
    38		ret = filemap_fault(vmf);
    39		ocfs2_unblock_signals(&oldset);
    40	
  > 41		trace_ocfs2_fault(OCFS2_I(inode)->ip_blkno,
    42				  vmf->page, vmf->pgoff);
    43		return ret;
    44	}
    45	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki