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-rw-r--r--fs/nilfs2/ioctl.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index b44bdb291b84..d22281d60071 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -57,6 +57,14 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
if (argv->v_size > PAGE_SIZE)
return -EINVAL;
+ /*
+ * Reject pairs of a start item position (argv->v_index) and a
+ * total count (argv->v_nmembs) which leads position 'pos' to
+ * overflow by the increment at the end of the loop.
+ */
+ if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
+ return -EINVAL;
+
buf = (void *)__get_free_pages(GFP_NOFS, 0);
if (unlikely(!buf))
return -ENOMEM;