If soc_dapm_read() fails, reg_val will be uninitialized, and bogus values will be written later:
sound/soc/soc-dapm.c: In function 'snd_soc_dapm_get_enum_double': sound/soc/soc-dapm.c:2862:15: warning: 'reg_val' may be used uninitialized in this function [-Wmaybe-uninitialized] unsigned int reg_val, val; ^
Return early on error to fix this.
Introduced by commit ce0fc93ae56e2ba50ff8c220d69e4e860e889320 ("ASoC: Add DAPM support at the component level"). --- Is this correct? Please review.
Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be --- sound/soc/soc-dapm.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 8348352dc2c6..177bd8639ef9 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -2860,12 +2860,14 @@ int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol, struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol); struct soc_enum *e = (struct soc_enum *)kcontrol->private_value; unsigned int reg_val, val; - int ret = 0;
- if (e->reg != SND_SOC_NOPM) - ret = soc_dapm_read(dapm, e->reg, ®_val); - else + if (e->reg != SND_SOC_NOPM) { + int ret = soc_dapm_read(dapm, e->reg, ®_val); + if (ret) + return ret; + } else { reg_val = dapm_kcontrol_get_value(kcontrol); + }
val = (reg_val >> e->shift_l) & e->mask; ucontrol->value.enumerated.item[0] = snd_soc_enum_val_to_item(e, val); @@ -2875,7 +2877,7 @@ int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol, ucontrol->value.enumerated.item[1] = val; }
- return ret; + return 0; } EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);