From: Jens Wiklander <jens.wiklander@linaro.org>
Date: Thu, 7 Nov 2019 11:42:49 +0100
Subject: tee: remove linked list of struct tee_shm
Git-commit: 59a135f6fb669f4f79f43160c7b8c8d6bfb37f75
Patch-mainline: v5.7-rc1
References: bsc#1193767 CVE-2021-44733

Removes list_shm from struct tee_context since the linked list isn't used
any longer.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
 [ bp: Drop the include/linux/tee_drv.h hunk to avoid kABI breakage ]
Acked-by: Borislav Petkov <bp@suse.de>
---
 drivers/tee/tee_core.c |    1 -
 drivers/tee/tee_shm.c  |   12 +-----------
 2 files changed, 1 insertion(+), 12 deletions(-)

--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -44,7 +44,6 @@ static struct tee_context *teedev_open(s
 
 	kref_init(&ctx->refcount);
 	ctx->teedev = teedev;
-	INIT_LIST_HEAD(&ctx->list_shm);
 	rc = teedev->desc->ops->open(ctx);
 	if (rc)
 		goto err;
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -17,8 +17,6 @@ static void tee_shm_release(struct tee_s
 
 	mutex_lock(&teedev->mutex);
 	idr_remove(&teedev->idr, shm->id);
-	if (shm->ctx)
-		list_del(&shm->link);
 	mutex_unlock(&teedev->mutex);
 
 	if (shm->flags & TEE_SHM_POOL) {
@@ -174,12 +172,8 @@ static struct tee_shm *__tee_shm_alloc(s
 		}
 	}
 
-	if (ctx) {
+	if (ctx)
 		teedev_ctx_get(ctx);
-		mutex_lock(&teedev->mutex);
-		list_add_tail(&shm->link, &ctx->list_shm);
-		mutex_unlock(&teedev->mutex);
-	}
 
 	return shm;
 err_rem:
@@ -306,10 +300,6 @@ struct tee_shm *tee_shm_register(struct
 		}
 	}
 
-	mutex_lock(&teedev->mutex);
-	list_add_tail(&shm->link, &ctx->list_shm);
-	mutex_unlock(&teedev->mutex);
-
 	return shm;
 err:
 	if (shm) {