* FAILED: patch "[PATCH] ALSA: pcm: disallow linking stream to itself" failed to apply to 4.19-stable tree
@ 2020-06-15 15:05 gregkh
2020-06-15 15:40 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: gregkh @ 2020-06-15 15:05 UTC (permalink / raw)
To: mirq-linux, tiwai; +Cc: stable
The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 951e2736f4b11b58dc44d41964fa17c3527d882a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@rere.qmqm.pl>
Date: Mon, 8 Jun 2020 18:50:39 +0200
Subject: [PATCH] ALSA: pcm: disallow linking stream to itself
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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>
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;
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: FAILED: patch "[PATCH] ALSA: pcm: disallow linking stream to itself" failed to apply to 4.19-stable tree
2020-06-15 15:05 FAILED: patch "[PATCH] ALSA: pcm: disallow linking stream to itself" failed to apply to 4.19-stable tree gregkh
@ 2020-06-15 15:40 ` Takashi Iwai
0 siblings, 0 replies; 2+ messages in thread
From: Takashi Iwai @ 2020-06-15 15:40 UTC (permalink / raw)
To: gregkh; +Cc: mirq-linux, stable
On Mon, 15 Jun 2020 17:05:11 +0200,
<gregkh@linuxfoundation.org> wrote:
>
>
> The patch below does not apply to the 4.19-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
It should be trivial to adapt this change to older branches.
I'll post it short later.
thanks,
Takashi
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> >From 951e2736f4b11b58dc44d41964fa17c3527d882a Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@rere.qmqm.pl>
> Date: Mon, 8 Jun 2020 18:50:39 +0200
> Subject: [PATCH] ALSA: pcm: disallow linking stream to itself
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> 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>
>
> 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;
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-06-15 15:05 FAILED: patch "[PATCH] ALSA: pcm: disallow linking stream to itself" failed to apply to 4.19-stable tree gregkh
2020-06-15 15:40 ` Takashi Iwai
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