Prevent SNDRV_PCM_IOCTL_LINK linking stream to itself - the code can't handle it. Fixed commit is not where bug was introduced, but changes the context significantly.
Cc: stable@vger.kernel.org Fixes: 0888c321de70 ("pcm_native: switch to fdget()/fdput()") Signed-off-by: Michał Mirosław mirq-linux@rere.qmqm.pl --- sound/core/pcm_native.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index aef860256278..3ad399cb6f30 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -2166,6 +2166,12 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) } pcm_file = f.file->private_data; substream1 = pcm_file->substream; + + if (substream == substream1) { + res = -EDEADLK; + goto _badf; + } + group = kzalloc(sizeof(*group), GFP_KERNEL); if (!group) { res = -ENOMEM;