linux-kernel - [PATCH 4.19 066/421] media: st-hva: Fix potential NULL pointer dereferences

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Message-Id: <20210719144948.469223159@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:47:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Evgeny Novikov <novikov@...ras.ru>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 066/421] media: st-hva: Fix potential NULL pointer dereferences

From: Evgeny Novikov <novikov@...ras.ru>

[ Upstream commit b7fdd208687ba59ebfb09b2199596471c63b69e3 ]

When ctx_id >= HVA_MAX_INSTANCES in hva_hw_its_irq_thread() it tries to
access fields of ctx that is NULL at that point. The patch gets rid of
these accesses.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/sti/hva/hva-hw.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/platform/sti/hva/hva-hw.c b/drivers/media/platform/sti/hva/hva-hw.c
index d826c011c095..6b852b0bb15a 100644
--- a/drivers/media/platform/sti/hva/hva-hw.c
+++ b/drivers/media/platform/sti/hva/hva-hw.c
@@ -130,8 +130,7 @@ static irqreturn_t hva_hw_its_irq_thread(int irq, void *arg)
 	ctx_id = (hva->sts_reg & 0xFF00) >> 8;
 	if (ctx_id >= HVA_MAX_INSTANCES) {
 		dev_err(dev, "%s     %s: bad context identifier: %d\n",
-			ctx->name, __func__, ctx_id);
-		ctx->hw_err = true;
+			HVA_PREFIX, __func__, ctx_id);
 		goto out;
 	}
 
-- 
2.30.2