In snd_soc_info_volsw(), mask is generated by figuring out the index of
the most significant bit set in max and converting the index to a
bitmask through bit shift 1. Unintended wraparound occurs when max is an
integer value with msb bit set. Since the bit shift value 1 is treated
as an integer type, the left shift operation will wraparound and set
mask to 0 instead of all 1's. In order to fix this, we type cast 1 as
`1ULL` to prevent the wraparound.
Fixes: 7077148fb50a ("ASoC: core: Split ops out of soc-core.c")
Signed-off-by: Stephen Lee <[email protected]>
---
This seems to show up in quite a few places in the alsa subsystem,
should they be addressed altogether?
---
sound/soc/soc-ops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 2d25748ca706..b27e89ff6a16 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -263,7 +263,7 @@ int snd_soc_get_volsw(struct snd_kcontrol *kcontrol,
int max = mc->max;
int min = mc->min;
int sign_bit = mc->sign_bit;
- unsigned int mask = (1 << fls(max)) - 1;
+ unsigned int mask = (1ULL << fls(max)) - 1;
unsigned int invert = mc->invert;
int val;
int ret;
--
2.43.2
On Mon, Mar 25, 2024 at 06:01:31PM -0700, Stephen Lee wrote:
> This seems to show up in quite a few places in the alsa subsystem,
> should they be addressed altogether?
Probably worth it, yes.
On Mon, 25 Mar 2024 18:01:31 -0700, Stephen Lee wrote:
> In snd_soc_info_volsw(), mask is generated by figuring out the index of
> the most significant bit set in max and converting the index to a
> bitmask through bit shift 1. Unintended wraparound occurs when max is an
> integer value with msb bit set. Since the bit shift value 1 is treated
> as an integer type, the left shift operation will wraparound and set
> mask to 0 instead of all 1's. In order to fix this, we type cast 1 as
> `1ULL` to prevent the wraparound.
>
> [...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC: ops: Fix wraparound for mask in snd_soc_get_volsw
commit: fc563aa900659a850e2ada4af26b9d7a3de6c591
All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing
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Thanks,
Mark