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tee: optee: Fix incorrect page free bug

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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@vger.kernel.org
Reported-by: Patrik Lantz <patrik.lantz@axis.com>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sumit Garg 2021-12-16 11:17:25 +05:30 • committed by Greg Kroah-Hartman
commit 806142c805
1 changed files with 2 additions and 4 deletions
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6
drivers/tee/optee/shm_pool.c
View file

@ -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,