From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chen-Yu Tsai , Mark Brown Subject: [PATCH 4.4 34/51] ASoC: dapm: Fix possible uninitialized variable in snd_soc_dapm_get_volsw() Date: Sat, 29 Oct 2016 09:49:35 -0400 Message-Id: <20161029134923.972741813@linuxfoundation.org> In-Reply-To: <20161029134922.501052551@linuxfoundation.org> References: <20161029134922.501052551@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chen-Yu Tsai commit 01ad5e7de67b408d9b48b437b06a9938ddf460b5 upstream. If soc_dapm_read() fails, val will be uninitialized, and bogus values will be written later: ret = soc_dapm_read(dapm, reg, &val); val = (val >> shift) & mask; However, the compiler does not give a warning. Return on error before val is really used to avoid this. This is similar to the commit 6912831623c5 ("ASoC: dapm: Fix uninitialized variable in snd_soc_dapm_get_enum_double()") Fixes: ce0fc93ae56e (ASoC: Add DAPM support at the component level) Signed-off-by: Chen-Yu Tsai Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- sound/soc/soc-dapm.c | 3 +++ 1 file changed, 3 insertions(+) --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -3015,6 +3015,9 @@ int snd_soc_dapm_get_volsw(struct snd_kc } mutex_unlock(&card->dapm_mutex); + if (ret) + return ret; + if (invert) ucontrol->value.integer.value[0] = max - val; else