linux-kernel - [PATCH] mm: initialize return of vm_insert

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Fri,  3 Jul 2020 07:52:02 -0700
From:   trix@...hat.com
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] mm: initialize return of vm_insert_pages

From: Tom Rix <trix@...hat.com>

clang static analysis reports a garbage return

In file included from mm/memory.c:84:
mm/memory.c:1612:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
        return err;
        ^~~~~~~~~~

The setting of err depends on a loop executing.
So initialize err.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index 17a3df0f3994..41513275823b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1601,7 +1601,7 @@ int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr,
 	return insert_pages(vma, addr, pages, num, vma->vm_page_prot);
 #else
 	unsigned long idx = 0, pgcount = *num;
-	int err;
+	int err = 0;
 
 	for (; idx < pgcount; ++idx) {
 		err = vm_insert_page(vma, addr + (PAGE_SIZE * idx), pages[idx]);
-- 
2.18.1