linux-kernel - [PATCH v2] optee: Fix multi page dynamic shm pool alloc

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Message-Id: <1577712160-7445-1-git-send-email-sumit.garg@linaro.org>
Date:   Mon, 30 Dec 2019 18:52:40 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     jens.wiklander@...aro.org
Cc:     tee-dev@...ts.linaro.org, Volodymyr_Babchuk@...m.com,
        jerome@...issier.org, etienne.carriere@...aro.org,
        vincent.t.cao@...el.com, linux-kernel@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>
Subject: [PATCH v2] optee: Fix multi page dynamic shm pool alloc

optee_shm_register() expected pages to be passed as an array of page
pointers rather than as an array of contiguous pages. So fix that via
correctly passing pages as per expectation.

Fixes: a249dd200d03 ("tee: optee: Fix dynamic shm pool allocations")
Reported-by: Vincent Cao <vincent.t.cao@...el.com>
Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
Tested-by: Vincent Cao <vincent.t.cao@...el.com>
---

Changes in v2:
- Fix memory leak for "pages" pointer.

 drivers/tee/optee/shm_pool.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c
index 0332a53..d767eeb 100644
--- a/drivers/tee/optee/shm_pool.c
+++ b/drivers/tee/optee/shm_pool.c
@@ -28,9 +28,22 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
 	shm->size = PAGE_SIZE << order;
 
 	if (shm->flags & TEE_SHM_DMA_BUF) {
+		unsigned int nr_pages = 1 << order, i;
+		struct page **pages;
+
+		pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL);
+		if (!pages)
+			return -ENOMEM;
+
+		for (i = 0; i < nr_pages; i++) {
+			pages[i] = page;
+			page++;
+		}
+
 		shm->flags |= TEE_SHM_REGISTER;
-		rc = optee_shm_register(shm->ctx, shm, &page, 1 << order,
+		rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
 					(unsigned long)shm->kaddr);
+		kfree(pages);
 	}
 
 	return rc;
-- 
2.7.4