On Mon, Feb 1, 2016 at 11:36 AM, Takashi Iwai <tiwai@xxxxxxx> wrote: > On Mon, 01 Feb 2016 11:15:08 +0100, > Dmitry Vyukov wrote: >> >> Hello, >> >> The following program triggers WARNING in snd_rawmidi_kernel_write1: >> >> // autogenerated by syzkaller (http://github.com/google/syzkaller) >> #include <unistd.h> >> #include <sys/types.h> >> #include <sys/stat.h> >> #include <sys/uio.h> >> #include <fcntl.h> >> >> int main() >> { >> int fd; >> struct iovec iov; >> >> fd = open("/dev/snd/midiC3D0", O_RDWR); > > What is the 3rd device? Please show /proc/asound/cards content. Missed this question. Here is it. I run qemu with "-soundhw all" flag. 0 [Dummy ]: Dummy - Dummy Dummy 1 1 [Loopback ]: Loopback - Loopback Loopback 1 2 [VirMIDI ]: VirMIDI - VirMIDI Virtual MIDI Card 1 3 [port ]: MTPAV - MTPAV on parallel port MTPAV on parallel port at 0x378 4 [pcsp ]: PC-Speaker - pcsp Internal PC-Speaker at port 0x61 5 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfebf0000 irq 24 But the patch helps with the warning message :) >> iov.iov_base = ""; >> iov.iov_len = 0; >> writev(fd, &iov, 1); >> return 0; >> } >> >> >> ------------[ cut here ]------------ >> WARNING: CPU: 1 PID: 27775 at sound/core/rawmidi.c:1181 > > The fix is easy, just remove snd_BUG_ON() like below. > > > thanks, > > Takashi > > --- > diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c > index a7759846fbaa..f75d1656272c 100644 > --- a/sound/core/rawmidi.c > +++ b/sound/core/rawmidi.c > @@ -1178,7 +1178,7 @@ static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, > long count1, result; > struct snd_rawmidi_runtime *runtime = substream->runtime; > > - if (snd_BUG_ON(!kernelbuf && !userbuf)) > + if (!kernelbuf && !userbuf) > return -EINVAL; > if (snd_BUG_ON(!runtime->buffer)) > return -EINVAL; > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
