linux-kernel - [PATCH v2] usb: dwc3: exynos: Fix error handling of clk_prepare

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Date:   Tue, 22 Jan 2019 00:23:50 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Felipe Balbi <balbi@...nel.org>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH v2] usb: dwc3: exynos: Fix error handling of clk_prepare_enable

If clk_prepare_enable() fails in dwc3_exynos_probe() or in
dwc3_exynos_resume(), exynos->clks[0] is left undisabled
because of usage preincrement in while condition.

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Fixes: 9f2168367a0a ("usb: dwc3: exynos: Rework clock handling and prepare for new variants")
---
v2: Add fix for the second instance in dwc3_exynos_resume() per Marek Szyprowski note.

 drivers/usb/dwc3/dwc3-exynos.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index cb7fcd7c0ad8..c1e9ea621f41 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -78,7 +78,7 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 	for (i = 0; i < exynos->num_clks; i++) {
 		ret = clk_prepare_enable(exynos->clks[i]);
 		if (ret) {
-			while (--i > 0)
+			while (i-- > 0)
 				clk_disable_unprepare(exynos->clks[i]);
 			return ret;
 		}
@@ -223,7 +223,7 @@ static int dwc3_exynos_resume(struct device *dev)
 	for (i = 0; i < exynos->num_clks; i++) {
 		ret = clk_prepare_enable(exynos->clks[i]);
 		if (ret) {
-			while (--i > 0)
+			while (i-- > 0)
 				clk_disable_unprepare(exynos->clks[i]);
 			return ret;
 		}
-- 
2.7.4