linux-kernel - [PATCH] dmaengine: qcom-adm: fix wrong sizeof config in slave

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Message-Id: <20220915204844.3838-1-ansuelsmth@gmail.com>
Date:   Thu, 15 Sep 2022 22:48:44 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Vinod Koul <vkoul@...nel.org>, Mark Brown <broonie@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-arm-msm@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Christian Marangi <ansuelsmth@...il.com>, stable@...r.kernel.org
Subject: [PATCH] dmaengine: qcom-adm: fix wrong sizeof config in slave_config

Fix broken slave_config function that uncorrectly compare the
peripheral_size with the size of the config pointer instead of the size
of the config struct. This cause the crci value to be ignored and cause
a kernel panic on any slave that use adm driver.

To fix this, compare to the size of the struct and NOT the size of the
pointer.

Fixes: 03de6b273805 ("dmaengine: qcom-adm: stop abusing slave_id config")
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
Cc: stable@...r.kernel.org # v5.17+
---
 drivers/dma/qcom/qcom_adm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/qcom_adm.c b/drivers/dma/qcom/qcom_adm.c
index facdacf8aede..c77d9de853de 100644
--- a/drivers/dma/qcom/qcom_adm.c
+++ b/drivers/dma/qcom/qcom_adm.c
@@ -494,7 +494,7 @@ static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
 
 	spin_lock_irqsave(&achan->vc.lock, flag);
 	memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
-	if (cfg->peripheral_size == sizeof(config))
+	if (cfg->peripheral_size == sizeof(*config))
 		achan->crci = config->crci;
 	spin_unlock_irqrestore(&achan->vc.lock, flag);
 
-- 
2.37.2