From: Takashi Iwai tiwai@suse.de
commit dfa9a5efe8b932a84b3b319250aa3ac60c20f876 upstream.
The rawmidi state flags (opened, append, active_sensing) are stored in bit fields that can be potentially racy when concurrently accessed without any locks. Although the current code should be fine, there is also no any real benefit by keeping the bitfields for this kind of short number of members.
This patch changes those bit fields flags to the simple bool fields. There should be no size increase of the snd_rawmidi_substream by this change.
Reported-by: syzbot+576cc007eb9f2c968200@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20200214111316.26939-4-tiwai@suse.de Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/sound/rawmidi.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/include/sound/rawmidi.h +++ b/include/sound/rawmidi.h @@ -92,9 +92,9 @@ struct snd_rawmidi_substream { struct list_head list; /* list of all substream for given stream */ int stream; /* direction */ int number; /* substream number */ - unsigned int opened: 1, /* open flag */ - append: 1, /* append flag (merge more streams) */ - active_sensing: 1; /* send active sensing when close */ + bool opened; /* open flag */ + bool append; /* append flag (merge more streams) */ + bool active_sensing; /* send active sensing when close */ int use_count; /* use counter (for output) */ size_t bytes; struct snd_rawmidi *rmidi;