From: Ma Wupeng <mawupeng1@xxxxxxxxxx>
Check and return 0 if len == 0 at the beginning of the function.
Return -EINVAL if len overflows for set_mempolicy_home_node.
Signed-off-by: Ma Wupeng <mawupeng1@xxxxxxxxxx>
---
mm/mempolicy.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 02c8a712282f..85c5d3c2503b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1512,13 +1512,16 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
if (home_node >= MAX_NUMNODES || !node_online(home_node))
return -EINVAL;
+ if (!len)
+ return 0;
+
len = PAGE_ALIGN(len);
- end = start + len;
+ if (!len)
+ return -EINVAL;
+ end = start + len;
if (end < start)
return -EINVAL;
- if (end == start)
- return 0;
mmap_write_lock(mm);
for_each_vma_range(vmi, vma, end) {
vmstart = max(start, vma->vm_start);
--
2.25.1
