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ASoC: rt1011: fix KASAN out-of-bounds bug in find_next_bit() 

KASAN throws the following warning in rt1011.c:
[ 170.777603] BUG: KASAN: stack-out-of-bounds in _find_next_bit.constprop.0+0x3e/0xf0

find_next_bit() relies on unsigned long pointer arguments, but this driver
uses a type cast that generates the KASAN warning. Replace find_next_bit()
and find_last_bit() with __ffs() and __fls() to pass the value and avoid
casting pointers to make the warning go away.

Signed-off-by: Fred Oh <fred.oh@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200622151348.28063-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Fred Oh 2020-06-22 10:13:48 -05:00 committed by Mark Brown
parent b1647f9f4f
commit ee8a41cd30
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 13 additions and 7 deletions
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20
sound/soc/codecs/rt1011.c
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@ -1849,13 +1849,13 @@ static int rt1011_set_tdm_slot(struct snd_soc_dai *dai,
/* Rx slot configuration */
rx_slotnum = hweight_long(rx_mask);
first_bit = find_next_bit((unsigned long *)&rx_mask, 32, 0);
if (rx_slotnum > 1 || rx_slotnum == 0) {
if (rx_slotnum > 1 || !rx_slotnum) {
ret = -EINVAL;
dev_dbg(component->dev, "too many rx slots or zero slot\n");
dev_err(component->dev, "too many rx slots or zero slot\n");
goto _set_tdm_err_;
}
first_bit = __ffs(rx_mask);
switch (first_bit) {
case 0:
case 2:
@ -1892,11 +1892,17 @@ static int rt1011_set_tdm_slot(struct snd_soc_dai *dai,
/* Tx slot configuration */
tx_slotnum = hweight_long(tx_mask);
first_bit = find_next_bit((unsigned long *)&tx_mask, 32, 0);
last_bit = find_last_bit((unsigned long *)&tx_mask, 32);
if (tx_slotnum > 2 || (last_bit-first_bit) > 1) {
if (tx_slotnum > 2 || !tx_slotnum) {
ret = -EINVAL;
dev_dbg(component->dev, "too many tx slots or tx slot location error\n");
dev_err(component->dev, "too many tx slots or zero slot\n");
goto _set_tdm_err_;
}
first_bit = __ffs(tx_mask);
last_bit = __fls(tx_mask);
if (last_bit - first_bit > 1) {
ret = -EINVAL;
dev_err(component->dev, "tx slot location error\n");
goto _set_tdm_err_;
}