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ALSA: sound/pci/ctxfi/ctpcm.c: Remove potential for use after free 

In each function, the value apcm is stored in the private_data field of
runtime.  At the same time the function ct_atc_pcm_free_substream is stored
in the private_free field of the same structure.  ct_atc_pcm_free_substream
dereferences and ultimately frees the value in the private_data field.  But
each function can exit in an error case with apcm having been freed, in
which case a subsequent call to the private_free function would perform a
dereference after free.  On the other hand, if the private_free field is
not initialized, it is NULL, and not invoked (see snd_pcm_detach_substream
in sound/core/pcm.c).  To avoid the introduction of a dangling pointer, the
initializations of the private_data and private_free fields are moved to
the end of the function, past any possible free of apcm.  This is safe
because the previous calls to snd_pcm_hw_constraint_integer and
snd_pcm_hw_constraint_minmax, which take runtime as an argument, do not
refer to either of these fields.

In each function, there is one error case where apcm needs to be freed, and
a call to kfree is added.

The sematic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e,e1,e2,e3;
identifier f,free1,free2;
expression a;
@@

*e->f = a
... when != e->f = e1
    when any
if (...) {
  ... when != free1(...,e,...)
      when != e->f = e2
* kfree(a)
  ... when != free2(...,e,...)
      when != e->f = e3
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Julia Lawall 2010-11-09 23:00:41 +01:00 committed by Takashi Iwai
parent e916151201
commit fa2b30af84
1 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
sound/pci/ctxfi/ctpcm.c
View File

@ -129,8 +129,6 @@ static int ct_pcm_playback_open(struct snd_pcm_substream *substream)
apcm->substream = substream;
apcm->interrupt = ct_atc_pcm_interrupt;
runtime->private_data = apcm;
runtime->private_free = ct_atc_pcm_free_substream;
if (IEC958 == substream->pcm->device) {
runtime->hw = ct_spdif_passthru_playback_hw;
atc->spdif_out_passthru(atc, 1);
@ -155,8 +153,12 @@ static int ct_pcm_playback_open(struct snd_pcm_substream *substream)
}
apcm->timer = ct_timer_instance_new(atc->timer, apcm);
if (!apcm->timer)
if (!apcm->timer) {
kfree(apcm);
return -ENOMEM;
}
runtime->private_data = apcm;
runtime->private_free = ct_atc_pcm_free_substream;
return 0;
}
@ -278,8 +280,6 @@ static int ct_pcm_capture_open(struct snd_pcm_substream *substream)
apcm->started = 0;
apcm->substream = substream;
apcm->interrupt = ct_atc_pcm_interrupt;
runtime->private_data = apcm;
runtime->private_free = ct_atc_pcm_free_substream;
runtime->hw = ct_pcm_capture_hw;
runtime->hw.rate_max = atc->rsr * atc->msr;
@ -298,8 +298,12 @@ static int ct_pcm_capture_open(struct snd_pcm_substream *substream)
}
apcm->timer = ct_timer_instance_new(atc->timer, apcm);
if (!apcm->timer)
if (!apcm->timer) {
kfree(apcm);
return -ENOMEM;
}
runtime->private_data = apcm;
runtime->private_free = ct_atc_pcm_free_substream;
return 0;
}