linux-kernel - [PATCH 4.17 091/324] x86/microcode/intel: Fix memleak in save_microcode

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Message-Id: <20180823075000.402568886@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:52:37 +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, Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Srinivas REDDY Eeda <srinivas.eeda@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 091/324] x86/microcode/intel: Fix memleak in save_microcode_patch()

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhenzhong Duan <zhenzhong.duan@...cle.com>

[ Upstream commit 0218c766263e70795c5eaa17d75ed54bca350950 ]

Free useless ucode_patch entry when it's replaced.

[ bp: Drop the memfree_patch() two-liner. ]

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Srinivas REDDY Eeda <srinivas.eeda@...cle.com>
Link: http://lkml.kernel.org/r/888102f0-fd22-459d-b090-a1bd8a00cb2b@default
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kernel/cpu/microcode/intel.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -190,8 +190,11 @@ static void save_microcode_patch(void *d
 			p = memdup_patch(data, size);
 			if (!p)
 				pr_err("Error allocating buffer %p\n", data);
-			else
+			else {
 				list_replace(&iter->plist, &p->plist);
+				kfree(iter->data);
+				kfree(iter);
+			}
 		}
 	}