linux-kernel - [PATCH 5.13 112/175] optee: Fix memory leak when failing to register shm pages

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Date:   Tue, 10 Aug 2021 19:30:20 +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, Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>
Subject: [PATCH 5.13 112/175] optee: Fix memory leak when failing to register shm pages

From: Tyler Hicks <tyhicks@...ux.microsoft.com>

commit ec185dd3ab257dc2a60953fdf1b6622f524cc5b7 upstream.

Free the previously allocated pages when we encounter an error condition
while attempting to register the pages with the secure world.

Fixes: a249dd200d03 ("tee: optee: Fix dynamic shm pool allocations")
Fixes: 5a769f6ff439 ("optee: Fix multi page dynamic shm pool alloc")
Cc: stable@...r.kernel.org
Signed-off-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
Reviewed-by: Jens Wiklander <jens.wiklander@...aro.org>
Reviewed-by: Sumit Garg <sumit.garg@...aro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tee/optee/shm_pool.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/tee/optee/shm_pool.c
+++ b/drivers/tee/optee/shm_pool.c
@@ -36,8 +36,10 @@ static int pool_op_alloc(struct tee_shm_
 		struct page **pages;
 
 		pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL);
-		if (!pages)
-			return -ENOMEM;
+		if (!pages) {
+			rc = -ENOMEM;
+			goto err;
+		}
 
 		for (i = 0; i < nr_pages; i++) {
 			pages[i] = page;
@@ -48,8 +50,14 @@ static int pool_op_alloc(struct tee_shm_
 		rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
 					(unsigned long)shm->kaddr);
 		kfree(pages);
+		if (rc)
+			goto err;
 	}
 
+	return 0;
+
+err:
+	__free_pages(page, order);
 	return rc;
 }