linux-kernel - [PATCH] mm: Optimizing error condition detection in do_mprotect

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Date:   Mon, 18 Jan 2021 21:33:10 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, haitao.huang@...el.com,
        Kai Huang <kai.huang@...el.com>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        Jia Zhang <zhang.jia@...ux.alibaba.com>
Cc:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Subject: [PATCH] mm: Optimizing error condition detection in do_mprotect_pkey()

Obviously, the error variable detection of the if statement is
for the mprotect callback function, so it is also put into the
scope of calling callbck.

Reported-by: Jia Zhang <zhang.jia@...ux.alibaba.com>
Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
---
 mm/mprotect.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index ab709023e9aa..94188df1ee55 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -617,10 +617,11 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
 		if (tmp > end)
 			tmp = end;
 
-		if (vma->vm_ops && vma->vm_ops->mprotect)
+		if (vma->vm_ops && vma->vm_ops->mprotect) {
 			error = vma->vm_ops->mprotect(vma, nstart, tmp, newflags);
-		if (error)
-			goto out;
+			if (error)
+				goto out;
+		}
 
 		error = mprotect_fixup(vma, &prev, nstart, tmp, newflags);
 		if (error)
-- 
2.19.1.3.ge56e4f7