On Mon, 21 Nov 2022 03:33:29 +0100,
Baisong Zhong wrote:
>
> Shifting signed 32-bit value by 31 bits is undefined, so changing
> significant bit to unsigned. The UBSAN warning calltrace like below:
>
> UBSAN: shift-out-of-bounds in sound/core/pcm_native.c:2676:21
> left shift of 1 by 31 places cannot be represented in type 'int'
> ...
> Call Trace:
> <TASK>
> dump_stack_lvl+0x8d/0xcf
> ubsan_epilogue+0xa/0x44
> __ubsan_handle_shift_out_of_bounds+0x1e7/0x208
> snd_pcm_open_substream+0x9f0/0xa90
> snd_pcm_oss_open.part.26+0x313/0x670
> snd_pcm_oss_open+0x30/0x40
> soundcore_open+0x18b/0x2e0
> chrdev_open+0xe2/0x270
> do_dentry_open+0x2f7/0x620
> path_openat+0xd66/0xe70
> do_filp_open+0xe3/0x170
> do_sys_openat2+0x357/0x4a0
> do_sys_open+0x87/0xd0
> do_syscall_64+0x34/0x80
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Baisong Zhong <zhongbaisong@xxxxxxxxxx>
> ---
> include/sound/pcm.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/sound/pcm.h b/include/sound/pcm.h
> index 7b1a022910e8..ec28c2ec89de 100644
> --- a/include/sound/pcm.h
> +++ b/include/sound/pcm.h
> @@ -123,7 +123,7 @@ struct snd_pcm_ops {
> #define SNDRV_PCM_RATE_384000 (1<<14) /* 384000Hz */
>
> #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
> -#define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
> +#define SNDRV_PCM_RATE_KNOT (1U<<31) /* supports more non-continuos rates */
Could you rather update all SNDRV_PCM_RATE_* to 1U?
Otherwise it'll look inconsistent.
thanks,
Takashi
