From: Dan Carpenter <dan.carpenter@oracle.com>
To: kbuild@lists.01.org, Zach O'Keefe <zokeefe@google.com>
Cc: lkp@intel.com, kbuild-all@lists.01.org,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [akpm-mm:mm-unstable 284/293] mm/khugepaged.c:2409 madvise_collapse() warn: possible memory leak of 'cc'
Date: Tue, 12 Jul 2022 15:35:35 +0300 [thread overview]
Message-ID: <202207100715.TBIYQ4fc-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head: 0e9f775fb0b4adf1a4ef50ea156ead09a0fc5194
commit: 9f626ffb1d1c5c26b4a8e0fdffec784a5f773274 [284/293] mm/madvise: introduce MADV_COLLAPSE sync hugepage collapse
config: i386-randconfig-m021 (https://download.01.org/0day-ci/archive/20220710/202207100715.TBIYQ4fc-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
smatch warnings:
mm/khugepaged.c:2409 madvise_collapse() warn: possible memory leak of 'cc'
vim +/cc +2409 mm/khugepaged.c
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2387 int madvise_collapse(struct vm_area_struct *vma, struct vm_area_struct **prev,
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2388 unsigned long start, unsigned long end)
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2389 {
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2390 struct collapse_control *cc;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2391 struct mm_struct *mm = vma->vm_mm;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2392 unsigned long hstart, hend, addr;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2393 int thps = 0, last_fail = SCAN_FAIL;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2394 bool mmap_locked = true;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2395
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2396 BUG_ON(vma->vm_start > start);
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2397 BUG_ON(vma->vm_end < end);
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2398
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2399 cc = kmalloc(sizeof(*cc), GFP_KERNEL);
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2400 if (!cc)
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2401 return -ENOMEM;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2402 cc->is_khugepaged = false;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2403 cc->last_target_node = NUMA_NO_NODE;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2404
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2405 *prev = vma;
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2406
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2407 /* TODO: Support file/shmem */
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 2408 if (!vma->anon_vma || !vma_is_anonymous(vma))
9f626ffb1d1c5c Zach O'Keefe 2022-07-06 @2409 return -EINVAL;
kfree(cc);?
--
0-DAY CI Kernel Test Service
https://01.org/lkp
next reply other threads:[~2022-07-12 12:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-12 12:35 Dan Carpenter [this message]
2022-07-12 13:46 ` Zach O'Keefe
2022-07-12 17:02 ` Yang Shi
2022-07-13 14:24 ` Zach O'Keefe
2022-07-13 19:04 ` Yang Shi
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