lkml.org 
[lkml]   [2023]   [Mar]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 4/4] mm/msync: return ENOMEM if len overflows for msync
Date
From: Ma Wupeng <mawupeng1@huawei.com>

Return -ENOMEM if len overflows for msync.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
mm/msync.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/msync.c b/mm/msync.c
index ac4c9bfea2e7..8ac227ec38af 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -36,6 +36,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
struct vm_area_struct *vma;
int unmapped_error = 0;
int error = -EINVAL;
+ size_t old_len = len;

start = untagged_addr(start);

@@ -48,7 +49,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
error = -ENOMEM;
len = (len + ~PAGE_MASK) & PAGE_MASK;
end = start + len;
- if (end < start)
+ if (end < start || (old_len != 0 && len == 0))
goto out;
error = 0;
if (end == start)
--
2.25.1
\
 
 \ /
  Last update: 2023-03-27 01:07    [W:0.057 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site