[PATCH] drivers/macintosh: Fix memleak in windfarm_pm112 driver

[Michael Ellerman]

On Thu, 23 Apr 2020 16:00:38 +1000, Michael Ellerman wrote:
> create_cpu_loop() calls smu_sat_get_sdb_partition() which does
> kmalloc() and returns the allocated buffer. In fact it's called twice,
> and neither buffer is freed.
> 
> This results in a memory leak as reported by Erhard:
>   unreferenced object 0xc00000047081f840 (size 32):
>     comm "kwindfarm", pid 203, jiffies 4294880630 (age 5552.877s)
>     hex dump (first 32 bytes):
>       c8 06 02 7f ff 02 ff 01 fb bf 00 41 00 20 00 00  ...........A. ..
>       00 07 89 37 00 a0 00 00 00 00 00 00 00 00 00 00  ...7............
>     backtrace:
>       [<0000000083f0a65c>] .smu_sat_get_sdb_partition+0xc4/0x2d0 [windfarm_smu_sat]
>       [<000000003010fcb7>] .pm112_wf_notify+0x104c/0x13bc [windfarm_pm112]
>       [<00000000b958b2dd>] .notifier_call_chain+0xa8/0x180
>       [<0000000070490868>] .blocking_notifier_call_chain+0x64/0x90
>       [<00000000131d8149>] .wf_thread_func+0x114/0x1a0
>       [<000000000d54838d>] .kthread+0x13c/0x190
>       [<00000000669b72bc>] .ret_from_kernel_thread+0x58/0x64
>   unreferenced object 0xc0000004737089f0 (size 16):
>     comm "kwindfarm", pid 203, jiffies 4294880879 (age 5552.050s)
>     hex dump (first 16 bytes):
>       c4 04 01 7f 22 11 e0 e6 ff 55 7b 12 ec 11 00 00  ...."....U{.....
>     backtrace:
>       [<0000000083f0a65c>] .smu_sat_get_sdb_partition+0xc4/0x2d0 [windfarm_smu_sat]
>       [<00000000b94ef7e1>] .pm112_wf_notify+0x1294/0x13bc [windfarm_pm112]
>       [<00000000b958b2dd>] .notifier_call_chain+0xa8/0x180
>       [<0000000070490868>] .blocking_notifier_call_chain+0x64/0x90
>       [<00000000131d8149>] .wf_thread_func+0x114/0x1a0
>       [<000000000d54838d>] .kthread+0x13c/0x190
>       [<00000000669b72bc>] .ret_from_kernel_thread+0x58/0x64
> 
> [...]

Applied to powerpc/next.

[1/1] drivers/macintosh: Fix memleak in windfarm_pm112 driver
      https://git.kernel.org/powerpc/c/93900337b9ac2f4eca427eff6d187be2dc3b5551

cheers