+/* Helper functions for NFS lock bounds checking */
+#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
+static int nfs_lock_check_bounds(const struct file_lock *fl)
+{
+ __s32 start, end;
+
+ start = (__s32)fl->fl_start;
+ if ((loff_t)start != fl->fl_start)
+ goto out_einval;
+
+ if (fl->fl_end != OFFSET_MAX) {
+ end = (__s32)fl->fl_end;
+ if ((loff_t)end != fl->fl_end)
+ goto out_einval;
+ } else
+ end = NFS_LOCK32_OFFSET_MAX;
+
+ if (start < 0 || start > end)
+ goto out_einval;
+ return 0;
+out_einval:
+ return -EINVAL;
+}