This is a note to let you know that I've just added the patch titled
tee: optee: Fix incorrect page free bug
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tee-optee-fix-incorrect-page-free-bug.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 18549bf4b21c739a9def39f27dcac53e27286ab5 Mon Sep 17 00:00:00 2001
From: Sumit Garg <sumit.garg@xxxxxxxxxx>
Date: Thu, 16 Dec 2021 11:17:25 +0530
Subject: tee: optee: Fix incorrect page free bug
From: Sumit Garg <sumit.garg@xxxxxxxxxx>
commit 18549bf4b21c739a9def39f27dcac53e27286ab5 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: ec185dd3ab25 ("optee: Fix memory leak when failing to register shm pages")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Patrik Lantz <patrik.lantz@xxxxxxxx>
Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxx>
Reviewed-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tee/optee/shm_pool.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/drivers/tee/optee/shm_pool.c
+++ b/drivers/tee/optee/shm_pool.c
@@ -41,10 +41,8 @@ static int pool_op_alloc(struct tee_shm_
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,
Patches currently in stable-queue which might be from sumit.garg@xxxxxxxxxx are
queue-5.15/tee-handle-lookup-of-shm-with-reference-count-0.patch
queue-5.15/tee-optee-fix-incorrect-page-free-bug.patch
