ALSA: fireface: fix locking bug in ff400_copy_msg_to_user()

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The ff400_copy_msg_to_user() function drops the spin lock to call
copy_to_user().  However, if the copy_to_user() fails, then it must
take the lock again before returning.  Failure to take the lock leads
to a double unlock in the caller, hwdep_read().

Fixes: acdebd8b4c ("ALSA: fireface: implement message parser for Fireface 400")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/Y8at+W/7OGvEBY8O@kili
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Dan Carpenter 2023-01-17 17:17:29 +03:00 • committed by Takashi Iwai

parent 3ee0fe7fa3

commit 81c254a65c

1 changed files with 8 additions and 6 deletions

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sound/firewire/fireface/ff-protocol-former.c

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