ALSA: pcm: prevent UAF in snd_pcm_info

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commit 362bca57f5 upstream.

When the device descriptor is closed, the `substream->runtime` pointer
is freed. But another thread may be in the ioctl handler, case
SNDRV_CTL_IOCTL_PCM_INFO. This case calls snd_pcm_info_user() which
calls snd_pcm_info() which accesses the now freed `substream->runtime`.

Note: this fixes CVE-2017-0861

Signed-off-by: Robb Glasser <rglasser@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Robb Glasser 2017-12-05 09:16:55 -08:00 • committed by Greg Kroah-Hartman

parent c6705e4c64

commit 0482dcd510

1 changed files with 2 additions and 0 deletions

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sound/core/pcm.c

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