linux-kernel - [PATCH] optee: remove address tag in check_mem

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Message-ID: <20201012092603.630703-1-volodymyr_babchuk@epam.com>
Date:   Mon, 12 Oct 2020 09:26:41 +0000
From:   Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>
To:     Jens Wiklander <jens.wiklander@...aro.org>
CC:     "tee-dev@...ts.linaro.org" <tee-dev@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>
Subject: [PATCH] optee: remove address tag in check_mem_type()

Before passing 'start' to find_vma() we need to remove
tags from it to get sane results.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@...m.com>
---
 drivers/tee/optee/call.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index a5afbe6dee68..61420395137b 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -562,6 +562,8 @@ static int check_mem_type(unsigned long start, size_t num_pages)
 	struct mm_struct *mm = current->mm;
 	int rc;
 
+	start = untagged_addr(start);
+
 	down_read(&mm->mmap_sem);
 	rc = __check_mem_type(find_vma(mm, start),
 			      start + num_pages * PAGE_SIZE);
-- 
2.27.0