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tee: fix memory leak in tee_shm_register()

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Moves the access_ok() check for valid memory range from user space from
the function tee_shm_register() to tee_ioctl_shm_register(). With this
we error out early before anything is done that must be undone on error.

Fixes: 578c349570 ("tee: add overflow check in register_shm_helper()")
Cc: stable@vger.kernel.org # 5.10
Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Wiklander 2022-08-23 10:23:26 +02:00 committed by Greg Kroah-Hartman
parent 3527e3cbb8
commit 606fe84a41
2 changed files with 3 additions and 3 deletions
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3
drivers/tee/tee_core.c
View file

@ -334,6 +334,9 @@ tee_ioctl_shm_register(struct tee_context *ctx,
if (data.flags)
return -EINVAL;
if (!access_ok((void __user *)(unsigned long)data.addr, data.length))
return -EFAULT;
shm = tee_shm_register(ctx, data.addr, data.length,
TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED);
if (IS_ERR(shm))

3
drivers/tee/tee_shm.c
View file

@ -222,9 +222,6 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
goto err;
}
if (!access_ok((void __user *)addr, length))
return ERR_PTR(-EFAULT);
mutex_lock(&teedev->mutex);
shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);