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Chen Ridong 15e8156713 mm: shrinker: avoid memleak in alloc_shrinker_info 
A memleak was found as below:

unreferenced object 0xffff8881010d2a80 (size 32):
  comm "mkdir", pid 1559, jiffies 4294932666
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  @...............
  backtrace (crc 2e7ef6fa):
    [<ffffffff81372754>] __kmalloc_node_noprof+0x394/0x470
    [<ffffffff813024ab>] alloc_shrinker_info+0x7b/0x1a0
    [<ffffffff813b526a>] mem_cgroup_css_online+0x11a/0x3b0
    [<ffffffff81198dd9>] online_css+0x29/0xa0
    [<ffffffff811a243d>] cgroup_apply_control_enable+0x20d/0x360
    [<ffffffff811a5728>] cgroup_mkdir+0x168/0x5f0
    [<ffffffff8148543e>] kernfs_iop_mkdir+0x5e/0x90
    [<ffffffff813dbb24>] vfs_mkdir+0x144/0x220
    [<ffffffff813e1c97>] do_mkdirat+0x87/0x130
    [<ffffffff813e1de9>] __x64_sys_mkdir+0x49/0x70
    [<ffffffff81f8c928>] do_syscall_64+0x68/0x140
    [<ffffffff8200012f>] entry_SYSCALL_64_after_hwframe+0x76/0x7e

alloc_shrinker_info(), when shrinker_unit_alloc() returns an errer, the
info won't be freed.  Just fix it.

Link: https://lkml.kernel.org/r/20241025060942.1049263-1-chenridong@huaweicloud.com
Fixes: 307bececcd ("mm: shrinker: add a secondary array for shrinker_info::{map, nr_deferred}")
Signed-off-by: Chen Ridong <chenridong@huawei.com>
Acked-by: Qi Zheng <zhengqi.arch@bytedance.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Wang Weiyang <wangweiyang2@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-10-31 20:27:04 -07:00
arch x86/traps: move kmsan check after instrumentation_begin 2024-10-28 21:40:39 -07:00
block block-6.12-20241026 2024-10-27 08:29:36 -10:00
certs
crypto
Documentation mseal: update mseal.rst 2024-10-28 21:40:41 -07:00
drivers platform-drivers-x86 for v6.12-3 2024-10-27 08:40:33 -10:00
fs nilfs2: fix potential deadlock with newly created symlinks 2024-10-30 20:14:12 -07:00
include mm: allow set/clear page_type again 2024-10-30 20:14:12 -07:00
init
io_uring
ipc
kernel resource,kexec: walk_system_ram_res_rev must retain resource flags 2024-10-28 21:40:40 -07:00
lib
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mm mm: shrinker: avoid memleak in alloc_shrinker_info 2024-10-31 20:27:04 -07:00
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tools tools/mm: -Werror fixes in page-types/slabinfo 2024-10-30 20:14:11 -07:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.