linux-kernel - [PATCH 2/3] clone.2: Check for MAP

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Date:   Sat, 16 Nov 2019 12:41:13 +0100
From:   Christian Brauner <christian@...uner.io>
To:     mtk.manpages@...il.com
Cc:     adrian@...as.de, akpm@...ux-foundation.org, arnd@...db.de,
        avagin@...il.com, christian.brauner@...ntu.com,
        dhowells@...hat.com, fweimer@...hat.com, jannh@...gle.com,
        keescook@...omium.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
        mingo@...e.hu, oleg@...hat.com, xemul@...tuozzo.com
Subject: [PATCH 2/3] clone.2: Check for MAP_FAILED not NULL on mmap()

From: Christian Brauner <christian.brauner@...ntu.com>

If mmap() fails it will return MAP_FAILED which according to the manpage
is (void *)-1 not NULL.

Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
---
 man2/clone.2 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/man2/clone.2 b/man2/clone.2
index 57a9eaba7..faff2ada6 100644
--- a/man2/clone.2
+++ b/man2/clone.2
@@ -1628,7 +1628,7 @@ main(int argc, char *argv[])
 
     stack = mmap(NULL, STACK_SIZE, PROT_READ | PROT_WRITE,
                  MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, \-1, 0);
-    if (stack == NULL)
+    if (stack == MAP_FAILED)
         errExit("mmap");
 
     stackTop = stack + STACK_SIZE;  /* Assume stack grows downward */
-- 
2.24.0