Re: [BUG] ALSA: core: seq: a possible double-lock bug in snd_seq_midisynth_remove()

[Takashi Iwai <tiwai@xxxxxxx>]

On Mon, 29 Jul 2019 05:54:07 +0200,
Jia-Ju Bai wrote:
> 
> In snd_seq_midisynth_remove(), there is a possible double-lock bug:
> snd_seq_midisynth_remove()
>     mutex_lock(&register_mutex); -- line 421
>     snd_seq_delete_kernel_client() --- line 436
>         seq_free_client() -- line 2244
>             mutex_lock(&register_mutex); -- line 294
> 
> This bug is found by a static analysis tool STCheck written by us.

No, it's a false-positive report.  Both register_mutex's are
static, hence they are local to each file.  That is, you're looking at
two different mutexes.


Takashi
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