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clone.2: Check for MAP_FAILED not NULL on mmap() 

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@ubuntu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Christian Brauner 2019-11-16 12:41:13 +01:00 committed by Michael Kerrisk
parent 225f5da8ac
commit 8eea66b8bb
1 changed files with 1 additions and 1 deletions
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man2/clone.2
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@ -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 */