tee: optee: Fix incorrect page free bug

stable inclusion
from stable-v5.10.89
commit ad338d825e3f7b96ee542bf313728af2d19fe9ad
bugzilla: 186140 https://gitee.com/openeuler/kernel/issues/I4S8HA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ad338d825e3f7b96ee542bf313728af2d19fe9ad

--------------------------------

commit 18549bf4 upstream.

Pointer to the allocated pages (struct page *page) has already
progressed towards the end of allocation. It is incorrect to perform
__free_pages(page, order) using this pointer as we would free any
arbitrary pages. Fix this by stop modifying the page pointer.

Fixes: ec185dd3 ("optee: Fix memory leak when failing to register shm pages")
Cc: stable@vger.kernel.org
Reported-by: NPatrik Lantz <patrik.lantz@axis.com>
Signed-off-by: NSumit Garg <sumit.garg@linaro.org>
Reviewed-by: NTyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: NJens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/tee/optee/shm_pool.c

@@ -41,10 +41,8 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
 			goto err;
 		}
 
-		for (i = 0; i < nr_pages; i++) {
-			pages[i] = page;
-			page++;
-		}
+		for (i = 0; i < nr_pages; i++)
+			pages[i] = page + i;
 
 		shm->flags |= TEE_SHM_REGISTER;
 		rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,