When reading the mmap codes, I found the checking of mm->map_count
against sysctl_max_map_count is not consistent. At some places, ">" is
used; at some other places, ">=" is used.
This patch changes ">" to ">=", so they are consistent, and makes sure
the value is not greater (one more) than sysctl_max_map_count.
Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index a7bf6a3..85f4816 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -987,7 +987,7 @@ unsigned long do_mmap_pgoff(struct file *file,
unsigned long addr,
return -EOVERFLOW;
/* Too many mappings? */
- if (mm->map_count > sysctl_max_map_count)
+ if (mm->map_count >= sysctl_max_map_count)
return -ENOMEM;
/* Obtain the address to map to. we verify (or select) it and ensure
@@ -2193,7 +2193,7 @@ unsigned long do_brk(unsigned long addr, unsigned
long len)
if (!may_expand_vm(mm, len >> PAGE_SHIFT))
return -ENOMEM;
- if (mm->map_count > sysctl_max_map_count)
+ if (mm->map_count >= sysctl_max_map_count)
return -ENOMEM;
if (security_vm_enough_memory_mm(mm, len >> PAGE_SHIFT))
--
1.7.6.5
--
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