Re: [PATCH v4 3/3] mm/slub: Fix memory leak of kobj->name in sysfs_slab_add()
From: Hyeonggon Yoo
Date: Thu Sep 05 2024 - 09:59:33 EST
On Thu, Sep 5, 2024 at 12:41 PM Jinjie Ruan <ruanjinjie@xxxxxxxxxx> wrote:
>
>
>
> On 2022/11/12 19:46, Liu Shixin wrote:
> > There is a memory leak of kobj->name in sysfs_slab_add():
> >
> > unreferenced object 0xffff88817e446440 (size 32):
> > comm "insmod", pid 4085, jiffies 4296564501 (age 126.272s)
> > hex dump (first 32 bytes):
> > 75 62 69 66 73 5f 69 6e 6f 64 65 5f 73 6c 61 62 ubifs_inode_slab
> > 00 65 44 7e 81 88 ff ff 00 00 00 00 00 00 00 00 .eD~............
> > backtrace:
> > [<000000005b30fbbd>] __kmalloc_node_track_caller+0x4e/0x150
> > [<000000002f70da0c>] kstrdup_const+0x4b/0x80
> > [<00000000c6712c61>] kobject_set_name_vargs+0x2f/0xb0
> > [<00000000b151218e>] kobject_init_and_add+0xb0/0x120
> > [<00000000e56a4cf5>] sysfs_slab_add+0x17d/0x220
> > [<000000009326fd57>] __kmem_cache_create+0x406/0x590
> > [<00000000dde33cff>] kmem_cache_create_usercopy+0x1fc/0x300
> > [<00000000fe90cedb>] kmem_cache_create+0x12/0x20
> > [<000000007a6531c8>] 0xffffffffa02d802d
> > [<000000000e3b13c7>] do_one_initcall+0x87/0x2a0
> > [<00000000995ecdcf>] do_init_module+0xdf/0x320
> > [<000000008821941f>] load_module+0x2f98/0x3330
> > [<00000000ef51efa4>] __do_sys_finit_module+0x113/0x1b0
> > [<000000009339fbce>] do_syscall_64+0x35/0x80
> > [<000000006b7f2033>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
>
>
> Hi,every one,
Hi.
> I found the same problem and it solve this problem with the patch, is
> there any plan to update the patch and solve it.
What kernel version do you use,
and when do you encounter it or how do you reproduce it?
--
Hyeonggon