linux-kernel - [PATCH] tee: fix memory leak in tee_dyn_shm_alloc

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Message-Id: <ae66122a86295f0ca5f2ff385ac2850360a805c1.1753251689.git.xiaopei01@kylinos.cn>
Date: Wed, 23 Jul 2025 14:22:41 +0800
From: Pei Xiao <xiaopei01@...inos.cn>
To: jens.wiklander@...aro.org,
	sumit.garg@...nel.org,
	balint.dobszay@....com,
	op-tee@...ts.trustedfirmware.org,
	linux-kernel@...r.kernel.org
Cc: Pei Xiao <xiaopei01@...inos.cn>
Subject: [PATCH] tee: fix memory leak in tee_dyn_shm_alloc_helper

When shm_register() fails in tee_dyn_shm_alloc_helper(), the pre-allocated
pages array is not freed, resulting in a memory leak.

Fixes: cf4441503e20 ("tee: optee: Move pool_op helper functions")
Signed-off-by: Pei Xiao <xiaopei01@...inos.cn>
---
 drivers/tee/tee_shm.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index 915239b033f5..2a7d253d9c55 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -230,7 +230,7 @@ int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t align,
 	pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
 	if (!pages) {
 		rc = -ENOMEM;
-		goto err;
+		goto err_pages;
 	}
 
 	for (i = 0; i < nr_pages; i++)
@@ -243,11 +243,13 @@ int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t align,
 		rc = shm_register(shm->ctx, shm, pages, nr_pages,
 				  (unsigned long)shm->kaddr);
 		if (rc)
-			goto err;
+			goto err_kfree;
 	}
 
 	return 0;
-err:
+err_kfree:
+	kfree(pages);
+err_pages:
 	free_pages_exact(shm->kaddr, shm->size);
 	shm->kaddr = NULL;
 	return rc;
-- 
2.25.1