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| author | Michał Mirosław <mirq-linux@rere.qmqm.pl> | 2020-06-08 18:50:39 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-06-08 19:35:29 +0200 |
| commit | 951e2736f4b11b58dc44d41964fa17c3527d882a (patch) | |
| tree | 7968e7e173b3bba281bc29e1d66ba621bb15a997 /sound/core | |
| parent | 88d8822d30cc6f668d44a1a7466bed5a1f85f607 (diff) | |
| download | lwn-951e2736f4b11b58dc44d41964fa17c3527d882a.tar.gz lwn-951e2736f4b11b58dc44d41964fa17c3527d882a.zip | |
ALSA: pcm: disallow linking stream to itself
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>
Link: https://lore.kernel.org/r/89c4a2487609a0ed6af3ecf01cc972bdc59a7a2d.1591634956.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/pcm_native.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index c08732998a42..eeab8850ed76 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -2176,6 +2176,12 @@ 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 = -EINVAL; + goto _badf; + } + group = kzalloc(sizeof(*group), GFP_KERNEL); if (!group) { res = -ENOMEM; |