linux-kernel - kmemleak detects leak in msr_build

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Date:   Tue, 11 Jan 2022 08:49:34 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: kmemleak detects leak in msr_build_context

Dear Linux folks,


Running Linux from commit bf4eebf8cfa2 (Merge tag 
'linux-kselftest-kunit-5.17-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest), 
kmemleak reported the leak below:

```
unreferenced object 0xffff8914823de500 (size 64):
   comm "swapper/0", pid 1, jiffies 4294667581 (age 1253.406s)
   hex dump (first 32 bytes):
     00 00 00 00 00 00 00 00 04 10 01 c0 00 00 00 00  ................
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000007f3b05e9>] __kmalloc+0x177/0x330
     [<0000000008104cca>] msr_build_context.constprop.0+0x32/0xbe
     [<00000000012bab4e>] msr_save_cpuid_features+0x28/0x2f
     [<00000000b7a2262e>] pm_check_save_msr+0x2e/0x40
     [<00000000cbe9d92d>] do_one_initcall+0x44/0x200
     [<0000000094deab7b>] kernel_init_freeable+0x1fc/0x273
     [<00000000d3dbaa56>] kernel_init+0x16/0x160
     [<0000000058c4a8b3>] ret_from_fork+0x22/0x30
```


Kind regards,

Paul