linux-kernel - [PATCH] x86/sgx: Fix a resource leak in sgx

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Date:   Tue,  2 Mar 2021 04:32:42 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     linux-sgx@...r.kernel.org
Cc:     Jarkko Sakkinen <jarkko@...nel.org>, stable@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Serge Ayoun <serge.ayoun@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jethro Beekman <jethro@...tanix.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/sgx: Fix a resource leak in sgx_init()

If sgx_page_cache_init() fails in the middle, a trivial return statement
causes unused memory and virtual address space reserved for the EPC
section, not freed. Fix this by using the same rollback, as when
sgx_page_reclaimer_init() fails.

Cc: stable@...r.kernel.org # 5.11
Fixes: e7e0545299d8 ("x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections")
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
 arch/x86/kernel/cpu/sgx/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 8df81a3ed945..52d070fb4c9a 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -708,8 +708,10 @@ static int __init sgx_init(void)
 	if (!cpu_feature_enabled(X86_FEATURE_SGX))
 		return -ENODEV;
 
-	if (!sgx_page_cache_init())
-		return -ENOMEM;
+	if (!sgx_page_cache_init()) {
+		ret = -ENOMEM;
+		goto err_page_cache;
+	}
 
 	if (!sgx_page_reclaimer_init()) {
 		ret = -ENOMEM;
-- 
2.30.1