ALSA: dice: fix array limits in dice_proc_read()

The array limits are supposed to be in units of u32 instead of in bytes.
The current code has a potential array overflow.

Fixes: c614475b0ea9 ('ALSA: dice: add a proc file to show device information')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 57bcd31fcc123c38cd293cab40b52310734698a2..c0aa64941cee0bd927450a6b69314d14f2f02bce 100644 (file)
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -1019,7 +1019,7 @@ static void dice_proc_read(struct snd_info_entry *entry,
 
        if (dice_proc_read_mem(dice, &tx_rx_header, sections[2], 2) < 0)
                return;
-       quadlets = min_t(u32, tx_rx_header.size, sizeof(buf.tx));
+       quadlets = min_t(u32, tx_rx_header.size, sizeof(buf.tx) / 4);
        for (stream = 0; stream < tx_rx_header.number; ++stream) {
                if (dice_proc_read_mem(dice, &buf.tx, sections[2] + 2 +
                                       stream * tx_rx_header.size,
@@ -1045,7 +1045,7 @@ static void dice_proc_read(struct snd_info_entry *entry,
 
        if (dice_proc_read_mem(dice, &tx_rx_header, sections[4], 2) < 0)
                return;
-       quadlets = min_t(u32, tx_rx_header.size, sizeof(buf.rx));
+       quadlets = min_t(u32, tx_rx_header.size, sizeof(buf.rx) / 4);
        for (stream = 0; stream < tx_rx_header.number; ++stream) {
                if (dice_proc_read_mem(dice, &buf.rx, sections[4] + 2 +
                                       stream * tx_rx_header.size,