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| author | Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> | 2020-12-10 18:25:40 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-12-11 16:23:01 +0300 |
| commit | 631c78ed72bbf852cc09b24e4e4e412ed88770f2 (patch) | |
| tree | 3d1d12e3e166bdca6c2a1d3d13e325558f710e9d /sound/soc/soc-topology.c | |
| parent | f5824e5ce1cdba523a357a4d3ffbe0876a27330f (diff) | |
| download | linux-631c78ed72bbf852cc09b24e4e4e412ed88770f2.tar.xz | |
ASoC: topology: Fix wrong size check
Dan reported that smatch reports wrong size check and after analysis it
is confirmed that we are comparing wrong value: pointer size instead of
array size. However the check itself is problematic as in UAPI header
there are two fields:
struct snd_soc_tplg_enum_control {
(...)
char texts[SND_SOC_TPLG_NUM_TEXTS][SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
__le32 values[SND_SOC_TPLG_NUM_TEXTS * SNDRV_CTL_ELEM_ID_NAME_MAXLEN / 4];
the texts field is for names and the values one for values assigned to
those named fields, after analysis it becomes clear that there is quite
a lot overhead values than we may possibly name. So instead of changing
check to ARRAY_SIZE(ec->values), as it was first suggested, use
hardcoded value of SND_SOC_TPLG_NUM_TEXTS.
Link: https://lore.kernel.org/alsa-devel/X9B0eDcKy+9B6kZl@mwanda/
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20201210152541.191728-1-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/soc-topology.c')
| -rw-r--r-- | sound/soc/soc-topology.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c index e85b52798bc5..950c45008e24 100644 --- a/sound/soc/soc-topology.c +++ b/sound/soc/soc-topology.c @@ -892,10 +892,16 @@ static int soc_tplg_denum_create_values(struct soc_tplg *tplg, struct soc_enum * { int i; - if (le32_to_cpu(ec->items) > sizeof(*ec->values)) + /* + * Following "if" checks if we have at most SND_SOC_TPLG_NUM_TEXTS + * values instead of using ARRAY_SIZE(ec->values) due to the fact that + * it is oversized for its purpose. Additionally it is done so because + * it is defined in UAPI header where it can't be easily changed. + */ + if (le32_to_cpu(ec->items) > SND_SOC_TPLG_NUM_TEXTS) return -EINVAL; - se->dobj.control.dvalues = devm_kzalloc(tplg->dev, le32_to_cpu(ec->items) * + se->dobj.control.dvalues = devm_kcalloc(tplg->dev, le32_to_cpu(ec->items), sizeof(u32), GFP_KERNEL); if (!se->dobj.control.dvalues) |