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 | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index b44bdb2..a260a98 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -65,6 +65,8 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
ret = 0;
total = 0;
pos = argv->v_index;
+ if (pos > ULONG_MAX - argv->v_nmembs)
+ return -EINVAL;
for (i = 0; i < argv->v_nmembs; i += n) {
n = (argv->v_nmembs - i < maxmembs) ?
argv->v_nmembs - i : maxmembs;
--
1.8.5.rc1.28.g7061504
--
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