linux-kernel - [PATCH 5.17 206/219] ep93xx: clock: Fix UAF in ep93xx_clk_register

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Date:   Mon, 18 Apr 2022 14:12:55 +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, kernel test robot <lkp@...el.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 5.17 206/219] ep93xx: clock: Fix UAF in ep93xx_clk_register_gate()

From: Alexander Sverdlin <alexander.sverdlin@...il.com>

commit 3b68b08885217abd9c57ff9b3bb3eb173eee02a9 upstream.

arch/arm/mach-ep93xx/clock.c:154:2: warning: Use of memory after it is freed [clang-analyzer-unix.Malloc]
arch/arm/mach-ep93xx/clock.c:151:2: note: Taking true branch
if (IS_ERR(clk))
^
arch/arm/mach-ep93xx/clock.c:152:3: note: Memory is released
kfree(psc);
^~~~~~~~~~
arch/arm/mach-ep93xx/clock.c:154:2: note: Use of memory after it is freed
return &psc->hw;
^ ~~~~~~~~

Fixes: 9645ccc7bd7a ("ep93xx: clock: convert in-place to COMMON_CLK")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Cc: stable@...r.kernel.org
Link: https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/B5YCO2NJEXINCYE26Y255LCVMO55BGWW/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/mach-ep93xx/clock.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -148,8 +148,10 @@ static struct clk_hw *ep93xx_clk_registe
 	psc->lock = &clk_lock;
 
 	clk = clk_register(NULL, &psc->hw);
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
 		kfree(psc);
+		return ERR_CAST(clk);
+	}
 
 	return &psc->hw;
 }