v1->v2
*Check on every iteration is removed because the check before cycle is enough.
Check before entering into cycle.
The local variable 'pos' comes from userspace. If a large number was
passed, there would be an integer overflow in the following line:
pos += n;
Signed-off-by: Wenliang Fan <fanwlexca@xxxxxxxxx>
---
fs/nilfs2/ioctl.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index b44bdb2..231c945 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -57,6 +57,9 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
if (argv->v_size > PAGE_SIZE)
return -EINVAL;
+ if (argv->v_index > (~(__u64)0 - argv->v_nmembs))
+ return -EINVAL;
+
buf = (void *)__get_free_pages(GFP_NOFS, 0);
if (unlikely(!buf))
return -ENOMEM;
--
1.8.5.rc1.28.g7061504
--
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