Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-18 00:53:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

ALSA: control: Fix memory corruption risk in snd_ctl_elem_read

Browse Source 
The patch "ALSA: control: code refactoring for ELEM_READ/ELEM_WRITE
operations" introduced a potential for kernel memory corruption due
to an incorrect if statement allowing non-readable controls to fall
through and call the get function. For TLV controls a driver can omit
SNDRV_CTL_ELEM_ACCESS_READ to ensure that only the TLV get function
can be called. Instead the normal get() can be invoked unexpectedly
and as the driver expects that this will only be called for controls
<= 512 bytes, potentially try to copy >512 bytes into the 512 byte
return array, so corrupting kernel memory.

The problem is an attempt to refactor the snd_ctl_elem_read function
to invert the logic so that it conditionally aborted if the control
is unreadable instead of conditionally executing. But the if statement
wasn't inverted correctly.

The correct inversion of

    if (a && !b)

is
    if (!a || b)

Fixes: becf9e5d55 ("ALSA: control: code refactoring for ELEM_READ/ELEM_WRITE operations")
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Richard Fitzgerald 2018-02-27 17:01:18 +00:00 committed by Takashi Iwai
parent 71db96ddfa
commit 5a23699a39
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sound/core/control.c
View File

@ -889,7 +889,7 @@ static int snd_ctl_elem_read(struct snd_card *card,
index_offset = snd_ctl_get_ioff(kctl, &control->id); index_offset = snd_ctl_get_ioff(kctl, &control->id);
vd = &kctl->vd[index_offset]; vd = &kctl->vd[index_offset];
if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get == NULL) if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_READ) || kctl->get == NULL)
return -EPERM; return -EPERM;
snd_ctl_build_ioff(&control->id, kctl, index_offset); snd_ctl_build_ioff(&control->id, kctl, index_offset);