Commit 2490cdf6 authored Jan 06, 2018 by Dan Carpenter Committed by Jens Wiklander Jan 09, 2018

tee: shm: Potential NULL dereference calling tee_shm_register()



get_user_pages_fast() can return zero in certain error paths.  We should
handle that or else it means we accidentally return ERR_PTR(0) which is
NULL instead of an error pointer.  The callers are not expecting that
and will crash with a NULL dereference.

Fixes: 033ddf12 ("tee: add register user memory")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

parent c94f31b5

drivers/tee/tee_shm.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -283,7 +283,7 @@ struct tee_shm tee_shm_register(struct tee_context ctx, unsigned long addr,
		if (rc > 0)
		shm->num_pages = rc;
		if (rc != num_pages) {
		if (rc > 0)
		if (rc >= 0)
		rc = -ENOMEM;
		ret = ERR_PTR(rc);
		goto err;

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