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Signed-off-by: Ma Wupeng --- mm/mempolicy.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 02c8a712282f..153fda1ebb9c 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1488,6 +1488,7 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le unsigned long, home_node, unsigned long, flags) { struct mm_struct *mm = current->mm; + unsigned long old_len = len; struct vm_area_struct *vma; struct mempolicy *new; unsigned long vmstart; @@ -1515,7 +1516,7 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le len = PAGE_ALIGN(len); end = start + len; - if (end < start) + if (end < start || (old_len != 0 && len == 0)) return -EINVAL; if (end == start) return 0; -- 2.25.1