linux-kernel - kmemleak reports leaking in efi_mem_reserve

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Date:   Wed, 28 Nov 2018 22:47:19 -0500
From:   Qian Cai <cai@....us>
To:     ard.biesheuvel@...aro.org
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: kmemleak reports leaking in efi_mem_reserve_persistent()

unreferenced object 0xffff8096c1acf580 (size 128):
  comm "swapper/63", pid 0, jiffies 4294937418 (age 1201.230s)
  hex dump (first 32 bytes):
    80 87 b5 c1 96 00 00 00 00 00 cc c2 16 00 00 00  ................
    00 00 01 00 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b  ........kkkkkkkk
  backtrace:
    [<000000001d2549ba>] kmem_cache_alloc_trace+0x430/0x500
    [<0000000093a6dfab>] efi_mem_reserve_persistent+0x50/0xf8
    [<000000000a730828>] its_cpu_init_lpis+0x394/0x4b8
    [<00000000edf04e07>] its_cpu_init+0x104/0x150
    [<000000004d0342c5>] gic_starting_cpu+0x34/0x40
    [<000000005d9da772>] cpuhp_invoke_callback+0x228/0x1d68
    [<0000000061eace9b>] notify_cpu_starting+0xc0/0x118
    [<0000000048bc2dc5>] secondary_start_kernel+0x23c/0x3b0
    [<0000000015137d6a>] 0xffffffffffffffff

# ./scripts/faddr2line vmlinux efi_mem_reserve_persistent+0x50/0xf8
efi_mem_reserve_persistent+0x50/0xf8:
kmalloc at include/linux/slab.h:546
(inlined by) efi_mem_reserve_persistent at drivers/firmware/efi/efi.c:979

This line,

rsv = kmalloc(sizeof(*rsv), GFP_ATOMIC);

I didn't see anything obviously. Is it just a false positive?