}
/* Duplicate found: leave non-NULL dup_ptr. */
- if (by_device && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
+ if (by_device
+ && (mnt_ptr->spec_device != NULL)
+ && (dup_ptr->spec_device != NULL)
+ && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
break;
else if (!by_device && (strcmp (mnt_ptr->dir, dup_ptr->dir) == 0))
break;