linux-kernel - [PATCH] ep93xx: clock: Fix UAF in mach-ep93xx/clock.c

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Date:   Wed, 27 Apr 2022 10:21:11 +0800
From:   Wan Jiabing <wanjiabing@...o.com>
To:     Hartley Sweeten <hsweeten@...ionengravers.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Nikita Shubin <nikita.shubin@...uefel.me>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Wan Jiabing <wanjiabing@...o.com>
Subject: [PATCH] ep93xx: clock: Fix UAF in mach-ep93xx/clock.c

Fix following coccicheck errors:
./arch/arm/mach-ep93xx/clock.c:351:9-12: ERROR: reference preceded by free on line 349
./arch/arm/mach-ep93xx/clock.c:458:9-12: ERROR: reference preceded by free on line 456

Fix two more potential UAF errors.

Link: https://lore.kernel.org/all/20220418121212.634259061@linuxfoundation.org/
Fixes: 9645ccc7bd7a ("ep93xx: clock: convert in-place to COMMON_CLK")
Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
---
 arch/arm/mach-ep93xx/clock.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 4fa6ea5461b7..35f3734e512c 100644
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -345,8 +345,10 @@ static struct clk_hw *clk_hw_register_ddiv(const char *name,
 	psc->hw.init = &init;
 
 	clk = clk_register(NULL, &psc->hw);
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
 		kfree(psc);
+		return ERR_CAST(clk);
+	}
 
 	return &psc->hw;
 }
@@ -452,8 +454,10 @@ static struct clk_hw *clk_hw_register_div(const char *name,
 	psc->hw.init = &init;
 
 	clk = clk_register(NULL, &psc->hw);
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
 		kfree(psc);
+		return ERR_CAST(clk);
+	}
 
 	return &psc->hw;
 }
-- 
2.35.3