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authorMichał Mirosław <mirq-linux@rere.qmqm.pl>2020-06-08 19:50:39 +0300
committerTakashi Iwai <tiwai@suse.de>2020-06-08 20:35:29 +0300
commit951e2736f4b11b58dc44d41964fa17c3527d882a (patch)
tree7968e7e173b3bba281bc29e1d66ba621bb15a997 /sound/core
parent88d8822d30cc6f668d44a1a7466bed5a1f85f607 (diff)
downloadlinux-951e2736f4b11b58dc44d41964fa17c3527d882a.tar.xz
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.c6
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;