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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: linux-sgx@vger.kernel.org
Subject: [PATCH for_v25 1/4] x86/sgx: Put SECS backing iff retrieving the backing succeeds
Date: Fri, 20 Dec 2019 16:31:53 -0800
Message-ID: <20191221003156.27236-2-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20191221003156.27236-1-sean.j.christopherson@intel.com>

Put the SECS backing if and only if retrieving the backing succeeded,
otherwise sgx_encl_put_backing() will consume uninitialized pointers.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kernel/cpu/sgx/reclaim.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/reclaim.c b/arch/x86/kernel/cpu/sgx/reclaim.c
index 21fbfe2ed9c4..67bda5528625 100644
--- a/arch/x86/kernel/cpu/sgx/reclaim.c
+++ b/arch/x86/kernel/cpu/sgx/reclaim.c
@@ -361,9 +361,9 @@ static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
 
 				sgx_free_page(encl->secs.epc_page);
 				encl->secs.epc_page = NULL;
+
+				sgx_encl_put_backing(&secs_backing, true);
 			}
-
-			sgx_encl_put_backing(&secs_backing, true);
 		}
 	}
 
-- 
2.24.1


  reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-21  0:31 [PATCH for_v25 0/4] x86/sgx: Reclaim bug fix and cleanup Sean Christopherson
2019-12-21  0:31 ` Sean Christopherson [this message]
2019-12-21  0:31 ` [PATCH for_v25 2/4] x86/sgx: Use goto to handle sgx_encl_get_backing() failure in SECS flows Sean Christopherson
2019-12-21  0:31 ` [PATCH for_v25 3/4] x86/sgx: Drop unused @encl parameter from __sgx_encl_ewb() Sean Christopherson
2019-12-21  0:31 ` [PATCH for_v25 4/4] x86/sgx: Pre-calculate VA slot virtual address in sgx_encl_ewb() Sean Christopherson
2020-01-02 17:06 ` [PATCH for_v25 0/4] x86/sgx: Reclaim bug fix and cleanup Jarkko Sakkinen

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