linux-kernel - [PATCH v1] staging: greybus: audio: fix uninitialized value issue

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Message-Id: <a5d4bb540e606d7980d4127a82e6af9b436e0642.1596730667.git.vaibhav.sr@gmail.com>
Date:   Thu,  6 Aug 2020 21:51:57 +0530
From:   Vaibhav Agarwal <vaibhav.sr@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Elder <elder@...nel.org>, Johan Hovold <johan@...nel.org>,
        Mark Greer <mgreer@...malcreek.com>
Cc:     greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Vaibhav Agarwal <vaibhav.sr@...il.com>,
        Colin Ian King <colin.king@...onical.com>
Subject: [PATCH v1] staging: greybus: audio: fix uninitialized value issue

The current implementation for gbcodec_mixer_dapm_ctl_put() uses
uninitialized gbvalue for comparison with updated value. This was found
using static analysis with coverity.

Uninitialized scalar variable (UNINIT)
11. uninit_use: Using uninitialized value
gbvalue.value.integer_value[0].
460        if (gbvalue.value.integer_value[0] != val) {

This patch fixes the issue with fetching the gbvalue before using it for
comparision.

Fixes: 6339d2322c47 ("greybus: audio: Add topology parser for GB codec")
Reported-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Vaibhav Agarwal <vaibhav.sr@...il.com>
---
 drivers/staging/greybus/audio_topology.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 2f9fdbdcd547..4b914d0edef2 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -456,6 +456,13 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 	val = ucontrol->value.integer.value[0] & mask;
 	connect = !!val;
 
+	ret = gb_pm_runtime_get_sync(bundle);
+	if (ret)
+		return ret;
+
+	ret = gb_audio_gb_get_control(module->mgmt_connection, data->ctl_id,
+				      GB_AUDIO_INVALID_INDEX, &gbvalue);
+
 	/* update ucontrol */
 	if (gbvalue.value.integer_value[0] != val) {
 		for (wi = 0; wi < wlist->num_widgets; wi++) {
@@ -466,16 +473,10 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 		gbvalue.value.integer_value[0] =
 			cpu_to_le32(ucontrol->value.integer.value[0]);
 
-		ret = gb_pm_runtime_get_sync(bundle);
-		if (ret)
-			return ret;
-
 		ret = gb_audio_gb_set_control(module->mgmt_connection,
 					      data->ctl_id,
 					      GB_AUDIO_INVALID_INDEX, &gbvalue);
 
-		gb_pm_runtime_put_autosuspend(bundle);
-
 		if (ret) {
 			dev_err_ratelimited(codec_dev,
 					    "%d:Error in %s for %s\n", ret,
@@ -483,6 +484,7 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 			return ret;
 		}
 	}
+	gb_pm_runtime_put_autosuspend(bundle);
 
 	return 0;
 }

base-commit: 5bbd90550da8f7bdac769b5825597e67183c9411
prerequisite-patch-id: 2b8901339222ff7b94f10cf2341734c0fb82591c
prerequisite-patch-id: 38dad8879a2b73bce6e89481973c7c5b82bd7145
prerequisite-patch-id: 5f0042ccedae292395ec617789be6bf465463c1c
prerequisite-patch-id: 35d001c366dfa4b567e59abbb37bd691a18f5e14
prerequisite-patch-id: f13ce918ebc3796cd3c81716a7b2adf4519e7387
prerequisite-patch-id: 0fcc6d38699a9b72ca94280d7a4dc18f0823b6f7
prerequisite-patch-id: 8074e935bdc3dd7b114245b0648552d0ff6871c9
-- 
2.27.0