Messages in this thread | | | Date | Mon, 21 Nov 2022 18:47:34 +0800 | Subject | Re: [PATCH -next] ALSA: seq: fix undefined behavior in bit shift for SNDRV_SEQ_FILTER_USE_EVENT | From | zhongbaisong <> |
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在 2022/11/21 18:35, Takashi Iwai 写道: > On Mon, 21 Nov 2022 05:36:25 +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/seq/seq_clientmgr.c:509:22 >> 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_seq_deliver_single_event.constprop.21+0x191/0x2f0 >> snd_seq_deliver_event+0x1a2/0x350 >> snd_seq_kernel_client_dispatch+0x8b/0xb0 >> snd_seq_client_notify_subscription+0x72/0xa0 >> snd_seq_ioctl_subscribe_port+0x128/0x160 >> snd_seq_kernel_client_ctl+0xce/0xf0 >> snd_seq_oss_create_client+0x109/0x15b >> alsa_seq_oss_init+0x11c/0x1aa >> do_one_initcall+0x80/0x440 >> kernel_init_freeable+0x370/0x3c3 >> kernel_init+0x1b/0x190 >> ret_from_fork+0x1f/0x30 >> </TASK> >> >> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") >> Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com> >> --- >> include/uapi/sound/asequencer.h | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/include/uapi/sound/asequencer.h b/include/uapi/sound/asequencer.h >> index 6d4a2c60808d..4c5c4dd15d02 100644 >> --- a/include/uapi/sound/asequencer.h >> +++ b/include/uapi/sound/asequencer.h >> @@ -331,7 +331,7 @@ typedef int __bitwise snd_seq_client_type_t; >> #define SNDRV_SEQ_FILTER_BROADCAST (1<<0) /* accept broadcast messages */ >> #define SNDRV_SEQ_FILTER_MULTICAST (1<<1) /* accept multicast messages */ >> #define SNDRV_SEQ_FILTER_BOUNCE (1<<2) /* accept bounce event in error */ >> -#define SNDRV_SEQ_FILTER_USE_EVENT (1<<31) /* use event filter */ >> +#define SNDRV_SEQ_FILTER_USE_EVENT (1U<<31) /* use event filter */ > > Similarly like the previous patch for PCM, could you update all > SNDRV_SEQ_FILTER_* to 1U for consistency? > > > thanks, > > Takashi
Hi, Takashi Thank you for your suggestion. I will update all SNDRV_SEQ_FILTER_* to 1U for consistency in v2.
Baisong Zhong .
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