Messages in this thread | | | Date | Tue, 17 Dec 2019 14:30:45 +0100 | From | Greg KH <> | Subject | Re: [BUG] ALSA: seq: a possible sleep-in-atomic-context bug in snd_virmidi_dev_receive_event() |
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On Tue, Dec 17, 2019 at 09:24:21PM +0800, Jia-Ju Bai wrote: > The driver may sleep while holding a read lock. > The function call path (from bottom to top) in Linux 4.19 is: > > sound/core/seq/seq_memory.c, 96: > copy_from_user in snd_seq_dump_var_event > sound/core/seq/seq_virmidi.c, 97: > snd_seq_dump_var_event in snd_virmidi_dev_receive_event > sound/core/seq/seq_virmidi.c, 88: > _raw_read_lock in snd_virmidi_dev_receive_event > > copy_from_user() can sleep at runtime. > > I am not sure how to properly fix this possible bug, so I only report it. > > This bug is found by a static analysis tool STCheck written by myself.
Patches for this is usually best :)
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