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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2021-01-11 14:02:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-19 18:27:33 +0100 |
| commit | 5b984e538bdf2a9ba1c1b147c35ee191953f2b86 (patch) | |
| tree | 94d42bc9a4e35085a53204fedd88fbf03e3f2b16 | |
| parent | c0e1ac275f1f617a36d5d187c919985842249136 (diff) | |
| download | linux-stable-5b984e538bdf2a9ba1c1b147c35ee191953f2b86.tar.gz linux-stable-5b984e538bdf2a9ba1c1b147c35ee191953f2b86.tar.bz2 linux-stable-5b984e538bdf2a9ba1c1b147c35ee191953f2b86.zip | |
ALSA: firewire-tascam: Fix integer overflow in midi_port_work()
commit 9f65df9c589f249435255da37a5dd11f1bc86f4d upstream.
As snd_fw_async_midi_port.consume_bytes is unsigned int, and
NSEC_PER_SEC is 1000000000L, the second multiplication in
port->consume_bytes * 8 * NSEC_PER_SEC / 31250
always overflows on 32-bit platforms, truncating the result. Fix this
by precalculating "NSEC_PER_SEC / 31250", which is an integer constant.
Note that this assumes port->consume_bytes <= 16777.
Fixes: 531f471834227d03 ("ALSA: firewire-lib/firewire-tascam: localize async midi port")
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210111130251.361335-3-geert+renesas@glider.be
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | sound/firewire/tascam/tascam-transaction.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c index 90288b4b4637..a073cece4a7d 100644 --- a/sound/firewire/tascam/tascam-transaction.c +++ b/sound/firewire/tascam/tascam-transaction.c @@ -209,7 +209,7 @@ static void midi_port_work(struct work_struct *work) /* Set interval to next transaction. */ port->next_ktime = ktime_add_ns(ktime_get(), - port->consume_bytes * 8 * NSEC_PER_SEC / 31250); + port->consume_bytes * 8 * (NSEC_PER_SEC / 31250)); /* Start this transaction. */ port->idling = false; |